Answer:
80
Step-by-step explanation:
40 times 2=80
Have a nice day!!!
How do you write 3x+4y=12 in slope-intercept form?
Answer:
y=-3/4x+3
Step-by-step explanation:
3x+4y=12
4y=12-3x
4y=-3x+12
y=-3/4x+12/4
y=-3/4x+3
Between which two integers is the value of the square root of 20
Answer:
4 and 5
Step-by-step explanation:
20 is greater than 4² = 16, and less than 5² = 25. So, the square root of 20 is between 4 and 5.
___
Your calculator will tell you that √20 ≈ 4.472, so is between 4 and 5.
Which polygon appears to be regular
Figure A
Figure B
Figure C
Figure D
Answer:
The answer is figure a :-)
The reason why is because all sides of figure A are equivalent.
Answer:
_____________________________________________
Step-by-step explanation:
sharice bought 8 songs that cost 0.79 each. She also bought an album. The total price of these items was 15.21 what was the price of the album?
Answer:
Step-by-step explanation:
0.79 x 8 =
6.72
15.21 - 6.72 =
Answer =
8.49
How do you calculate take-home pay?
The calculation of take home pay is the actual amount calculation of how much you will be credited on a job done well.
Step-by-step explanation:
Before calculation, things to be taken care of are -
Gross pay amountPersonal exemptionsTax statusDeductions of payrollNow knowing these much in exact form of amount, we may proceed to calculation -
The annual income according to the gross pay amount is calculated by simply multiplying the gross pay amount to 12.The FICA tax percentage is known according to the tax slab of your annual income, so determine the FICA tax percent amount Other Personal Exemptions with Standard Deduction and Pay Roll Deductions are to be calculatedSum up all the taxable income and non taxable income separately, and deduct the amount of tax from the taxable income.The left over amount now shown is the annual income.Divide the annual income after the tax deduction by 12 to know the take home pay for monthly basis.How do you solve the system of the linear equation by substitution?
y=x-4
4x-y=3
Answer:
x=-1/3, y=-13/3. (-1/3, -13/3).
Step-by-step explanation:
y=x-4
4x-y=3
------------
4x-(x-4)=3
4x-x+4=3
3x+4=3
3x=3-4
3x=-1
x=-1/3
y=-1/3-4
y=-1/3-12/3=-13/3
Answer: ([tex]-\frac{1}{3},-\frac{13}{3}[/tex]
Step-by-step explanation:
Substitut (x-4) into the equation of 4x-y=3
(Substitute what y equals into the equation
Make sure to keep parentheses!
That becomes 4x-(x-4)=3
Than you must distribute the negative to x and to -4
When you do it creates the equation of 4x-x+4=3
When combining like terms you get: 3x+4=3
Then solve -4 -4
3x=-1
3 3 x=-1
3
Than substitute the x in for the equation of y=x-4 to find what y equals! since you know that x equals -1/3 than subtract -1/3 - 4 to get
y= -13
3
prove that, tan θ ( 1 + cot ^ 2 θ ) / ( 1 + tan ^ 2 θ ) = cot θ
Answer:
(identity has been verified)
Step-by-step explanation:
Verify the following identity:
tan(θ) (cot(θ)^2 + 1)/(tan(θ)^2 + 1) = cot(θ)
Multiply both sides by tan(θ)^2 + 1:
tan(θ) (cot(θ)^2 + 1) = ^?cot(θ) (tan(θ)^2 + 1)
(cot(θ)^2 + 1) tan(θ) = tan(θ) + cot(θ)^2 tan(θ):
tan(θ) + cot(θ)^2 tan(θ) = ^?cot(θ) (tan(θ)^2 + 1)
cot(θ) (tan(θ)^2 + 1) = cot(θ) + cot(θ) tan(θ)^2:
tan(θ) + cot(θ)^2 tan(θ) = ^?cot(θ) + cot(θ) tan(θ)^2
Write cotangent as cosine/sine and tangent as sine/cosine:
sin(θ)/cos(θ) + sin(θ)/cos(θ) (cos(θ)/sin(θ))^2 = ^?cos(θ)/sin(θ) + cos(θ)/sin(θ) (sin(θ)/cos(θ))^2
(sin(θ)/cos(θ)) + (cos(θ)/sin(θ))^2 (sin(θ)/cos(θ)) = cos(θ)/sin(θ) + sin(θ)/cos(θ):
cos(θ)/sin(θ) + sin(θ)/cos(θ) = ^?(cos(θ)/sin(θ)) + (cos(θ)/sin(θ)) (sin(θ)/cos(θ))^2
(cos(θ)/sin(θ)) + (cos(θ)/sin(θ)) (sin(θ)/cos(θ))^2 = cos(θ)/sin(θ) + sin(θ)/cos(θ):
cos(θ)/sin(θ) + sin(θ)/cos(θ) = ^?cos(θ)/sin(θ) + sin(θ)/cos(θ)
The left hand side and right hand side are identical:
Answer: (identity has been verified)
By using the Pythagorean trigonometric identities and substituting the expressions of tan θ, sec θ, and csc θ, we can simplify the given expression to prove that tan θ (1 + cot2 θ) / (1 + tan2 θ) equals cot θ.
To prove that tan θ ( 1 + cot2 θ ) / ( 1 + tan2 θ ) = cot θ, we can use trigonometric identities. Recall the Pythagorean identity which states that cot2 θ + 1 = csc2 θ and tan2 θ + 1 = sec2 θ. Using these identities, we can rewrite the expression on the left side of the equation:
tan θ ( 1 + cot2 θ ) / ( 1 + tan2 θ ) = tan θ * csc2 θ / sec2 θ
Since sec θ = 1/cos θ and csc θ = 1/sin θ, and remembering that tan θ = sin θ / cos θ, we substitute these into the expression:
tan θ * csc2 θ / sec2 θ = (sin θ / cos θ) * (1/sin2 θ) / (1/cos2 θ)
With simplification, the sin2 θ in the numerator and denominator cancel out, as do the cos2 θ terms, leaving us with:
cos θ / sin θ = cot θ
Thus, the original expression simplifies to cot θ.
Mr. and Mrs. Lorenzo want to buy a home valued at $213,500. If they have 18% of this amount saved for a down payment, how
much have they saved?
a $384.30
b. $3,843.00
C. $38,043.00
d. $38,430.00
Answer:D
Step-by-step explanation:
Multiply the cost of the house by 0.18.
8.
A company manufactures cell phones. In August, a random sample
of 125 cell phones was inspected nd 3 phones were found to be
defective. The company manufactured 8,000 cell phones in August.
Based on the results from the sample, about how many cell phones
are expected to be defective?
@ 64 cell phones
B 192 cell phones
© 2,667 cell phones
D 3,360 cell phones
Answer:
b
Step-by-step explanation:
Lisa spots the mother bird on a branch above the nest. She
measures an angle of elevation to the bird of 67degrees. Find how
high the mother bird is above the ground, to the nearest foot.
To complete the calculations, more data is needed. We only have the angle of elevation of the mother bird, we need one relevant data, as for example, the distance from Lisa to the tree. We'll assume it to be 20 feet.
Answer:
The mother bird is 47 feet above the ground
Step-by-step explanation:
Right Triangles
They are a special type of triangles that have an internal angle of 90°. In such conditions, the following trigonometric relationship is valid:
[tex]\displaystyle tan\theta=\frac{y}{x}[/tex]
Where [tex]\theta[/tex] is the angle of elevation, y is the height of the triangle and x is the horizontal distance to the vertical leg
We can easily find the height of the tree by solving for y
[tex]y=xtan\theta[/tex]
[tex]y=20tan67^o[/tex]
[tex]y=47\ feet[/tex]
The mother bird is 47 feet above the ground
List all the factors of 56
Answer:
1*56 8*7 ECT
Step-by-step explanation:
56 one time=56. 7 8 times = 56
When an article was sold for #14
the profit was 40% What would
have been the proft, if it had
been sold for #16?
Answer:
45.7%
Step-by-step explanation:
16/14*40%=45.7%
The correct statement is that the profit is 60% if it had been sold for $16.
What is the percentage?The amount of something is expressed as if it is a part of the total which is a hundred. The ratio can be expressed as a fraction of 100. The word percent means per 100. It is represented by the symbol ‘%’.Triangle?
Given
When an article was sold for $14 the profit was 40%.
How to find the profit if it had been sold for $16?When an article was sold for $14 the profit was 40%.
Then, the cost of the article will be $10.
If the article is sold for $16.
Then profit will be
[tex]\rm Profit = \dfrac{selling\ price \ - \ cost\ price}{cost\ price}*100\\\\\rm Profit = \dfrac{16-10}{10}*100\\\\\rm Profit = 60 \%[/tex]
Thus, the profit will be 60%.
More about the percentage link is given below.
https://brainly.com/question/8011401
Find all real solutions of the quadratic equation. (Enter your answers as a comma-separated list. If there is no real solution, enter NO REAL SOLUTION.)
x2 − 6x + 1 = 0
Answer:
x= 1÷4
Step-by-step explanation:
2x - 6x + 1 =0
-4x + 1= 0
-4x = -1
Final answer:
Using the quadratic formula, the real solutions of the equation [tex]x^2 - 6x + 1 = 0[/tex]are x = 3 + 2√2 and x = 3 − 2√2 since the discriminant is positive, indicating two real solutions.
Explanation:
To find all real solutions of the quadratic equation [tex]x^2 - 6x + 1 = 0[/tex], we can use the quadratic formula, which is x = −b ± √(b2 − 4ac) / (2a) where a, b, and c are coefficients from the equation in the form [tex]ax^2 + bx + c = 0[/tex]. For our equation, a = 1, b = −6, and c = 1. Let's apply these values into the formula:
Calculate the discriminant: (−6)2 − 4(1)(1) = 36 − 4 = 32.
Since the discriminant is positive, there are two real solutions.
Calculate the solutions: x = (6 ± √32) / (2 × 1) = (6 ± 4√2) / 2 = 3 ± 2√2.
The real solutions of the equation are x = 3 + 2√2 and x = 3 − 2√2.
Write a function that represents the situation. Your $840 annual bonus increases by 5% each year
Answer:
[tex]f(x) = (840)\times (1.05)^{x}[/tex] where f(x) is the bonus every year and x is in number of years
Step-by-step explanation:
The function that represents the situation where $840 annual bonus increases by 5% each year is given by
[tex]f(x) = (840)\times (1.05)^{x}[/tex] where f(x) is the bonus every year and x is in number of years
Final answer:
The function representing an $840 annual bonus that increases by 5% each year is f(x) = 840(1 + 0.05)ˣ
Explanation:
To write a function that represents the situation where an $840 annual bonus increases by 5% each year, we can use an exponential growth model.
The general form of an exponential growth function is f(x) = a(1 + r)ˣ, where a is the initial amount, r is the growth rate, and x is the number of time periods.
In this case, the initial bonus a is $840, the growth rate r is 5% or 0.05, and x represents the number of years. Thus, the function can be written as:
f(x) = 840(1 + 0.05)ˣ
What is the value of x?
X=
Triangle: 9cm, 3x-20cm, 72cm, and 56cm
In this problem, we use the Triangle Inequality Theorem to find that the minimum value for x, which would yield a valid triangle, is 27.67.
Explanation:In this Mathematics problem, we're given a triangle with sides 9cm, 3x-20cm, 72cm, and 56cm. According to the Triangle Inequality Theorem, the sum of the lengths of any two sides of a triangle must be greater than the length of the third side. By doing this, we can set up an inequality to solve for x:
The two smaller sides must be greater than the third side: 9cm + (3x - 20cm) > 72cm.Then, simplify to: 3x - 11 > 72.Next, bring 11 to the right side: 3x > 83.Finally, divide by 3 on both sides: x > 27.67.So, the minimum value for x that would yield a valid triangle is 27.67.
Learn more about Triangle Inequality Theorem here:https://brainly.com/question/30956177
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What is 17 equals 5y - 3
John, Sally, and Natalie would all like to save some money. John decides that it
would be best to save money in a jar in his closet every single month. He decides
to start with $300, and then save $100 each month. Sally has $6000 and decides
to put her money in the bank in an account that has a 7% interest rate that is
compounded annually. Natalie has $5000 and decides to put her money in the
bank in an account that has a 10% interest rate that is compounded continuously.
How much money have after 2 years?
How much money will sally have in 10 years?
What type of exponential model is Natalie’s situation?
Write the model equation for Natalie’s situation
How much money will Natalie have after 2 years?
How much money will Natalie have after 10 years
Answer:
Part 1) John’s situation is modeled by a linear equation (see the explanation)
Part 2) [tex]y=100x+300[/tex]
Part 3) [tex]\$12,300[/tex]
Part 4) [tex]\$2,700[/tex]
Part 5) Is a exponential growth function
Part 6) [tex]A=6,000(1.07)^{t}[/tex]
Part 7) [tex]\$11,802.91[/tex]
Part 8) [tex]\$6,869.40[/tex]
Part 9) Is a exponential growth function
Part 10) [tex]A=5,000(e)^{0.10t}[/tex] or [tex]A=5,000(1.1052)^{t}[/tex]
Part 11) [tex]\$13,591.41[/tex]
Part 12) [tex]\$6,107.01[/tex]
Part 13) Natalie has the most money after 10 years
Part 14) Sally has the most money after 2 years
Step-by-step explanation:
Part 1) What type of equation models John’s situation?
Let
y ----> the total money saved in a jar
x ---> the time in months
The linear equation in slope intercept form
y=mx+b
The slope is equal to
[tex]m=\$100\ per\ month[/tex]
The y-intercept or initial value is
[tex]b=\$300[/tex]
so
[tex]y=100x+300[/tex]
therefore
John’s situation is modeled by a linear equation
Part 2) Write the model equation for John’s situation
see part 1)
Part 3) How much money will John have after 10 years?
Remember that
1 year is equal to 12 months
so
[tex]10\ years=10(12)=120 months[/tex]
For x=120 months
substitute in the linear equation
[tex]y=100(120)+300=\$12,300[/tex]
Part 4) How much money will John have after 2 years?
Remember that
1 year is equal to 12 months
so
[tex]2\ years=2(12)=24\ months[/tex]
For x=24 months
substitute in the linear equation
[tex]y=100(24)+300=\$2,700[/tex]
Part 5) What type of exponential model is Sally’s situation?
we know that
The compound interest formula is equal to
[tex]A=P(1+\frac{r}{n})^{nt}[/tex]
where
A is the Final Investment Value
P is the Principal amount of money to be invested
r is the rate of interest in decimal
t is Number of Time Periods
n is the number of times interest is compounded per year
in this problem we have
[tex]P=\$6,000\\ r=7\%=0.07\\n=1[/tex]
substitute in the formula above
[tex]A=6,000(1+\frac{0.07}{1})^{1*t}\\ A=6,000(1.07)^{t}[/tex]
therefore
Is a exponential growth function
Part 6) Write the model equation for Sally’s situation
see the Part 5)
Part 7) How much money will Sally have after 10 years?
For t=10 years
substitute the value of t in the exponential growth function
[tex]A=6,000(1.07)^{10}=\$11,802.91[/tex]
Part 8) How much money will Sally have after 2 years?
For t=2 years
substitute the value of t in the exponential growth function
[tex]A=6,000(1.07)^{2}=\$6,869.40[/tex]
Part 9) What type of exponential model is Natalie’s situation?
we know that
The formula to calculate continuously compounded interest is equal to
[tex]A=P(e)^{rt}[/tex]
where
A is the Final Investment Value
P is the Principal amount of money to be invested
r is the rate of interest in decimal
t is Number of Time Periods
e is the mathematical constant number
we have
[tex]P=\$5,000\\r=10\%=0.10[/tex]
substitute in the formula above
[tex]A=5,000(e)^{0.10t}[/tex]
Applying property of exponents
[tex]A=5,000(1.1052)^{t}[/tex]
therefore
Is a exponential growth function
Part 10) Write the model equation for Natalie’s situation
[tex]A=5,000(e)^{0.10t}[/tex] or [tex]A=5,000(1.1052)^{t}[/tex]
see Part 9)
Part 11) How much money will Natalie have after 10 years?
For t=10 years
substitute
[tex]A=5,000(e)^{0.10*10}=\$13,591.41[/tex]
Part 12) How much money will Natalie have after 2 years?
For t=2 years
substitute
[tex]A=5,000(e)^{0.10*2}=\$6,107.01[/tex]
Part 13) Who will have the most money after 10 years?
Compare the final investment after 10 years of John, Sally, and Natalie
Natalie has the most money after 10 years
Part 14) Who will have the most money after 2 years?
Compare the final investment after 2 years of John, Sally, and Natalie
Sally has the most money after 2 years
What is the decay factor of the exponential function represented by the table?
1/3
2/3
2
6
Answer: 1/3
Answer:
Option 2 (B) 2/3
Step-by-step explanation:
Got it correct
two sepp equtions with intgefs
9+m/3=2
slove
Answer: [tex]m=-21[/tex]
Step-by-step explanation:
In order to solve the exercise, you need to remember the following properties:
1. Addition property of equality:
If [tex]a=b[/tex], then [tex]a+c=b+c[/tex]
2. Subtraction property of equality:
If [tex]a=b[/tex], then [tex]a-c=b-c[/tex]
3. Divison property of equality:
If [tex]a=b[/tex], then [tex]\frac{a}{c}=\frac{b}{c}[/tex]
4. Multiplication property of equality:
If [tex]a=b[/tex], then [tex]a*c=b*c[/tex]
Then, given the following equation:
[tex]9+\frac{m}{3}=2[/tex]
You need to followw these steps in order solve for "m":
- Apply the Subtraction property of equality subtracting 9 from both sides of the equation:
[tex]9+\frac{m}{3}-9=2-9\\\\\frac{m}{3}=-7[/tex]
- Apply the Multiplication property of equality multiplying both sides of the equation by 3. Then, you get:
[tex](3)(\frac{m}{3})=(-7)(3)\\\\m=-21[/tex]
-3(-4n + 30) = -30 Answer please?
Answer:
n = 5
Step-by-step explanation:
Step 1 :
Step 2 :
Pulling out like terms :
2.1 Pull out like factors :
-4n + 30 = -2 • (2n - 15)
Equation at the end of step 2 :
(0 - -6 • (2n - 15)) - -30 = 0
Step 3 :
Step 4 :
Pulling out like terms :
4.1 Pull out like factors :
12n - 60 = 12 • (n - 5)
Equation at the end of step 4 :
12 • (n - 5) = 0
Step 5 :
Equations which are never true :
5.1 Solve : 12 = 0
This equation has no solution.
A a non-zero constant never equals zero.
Solving a Single Variable Equation :
5.2 Solve : n-5 = 0
Add 5 to both sides of the equation :
n = 5
One solution was found :
n = 5
Processing ends successfully
plz mark me as brainliest :)
To solve this, you need to isolate/get the variable "n" by itself in the equation:
-3(-4n + 30) = -30 Divide -3 on both sides
[tex]\frac{-3(-4n+30)}{-3} =\frac{-30}{-3}[/tex] [two negative signs cancel each other out and become positive]
-4n + 30 = 10 Subtract 30 on both sides
-4n + 30 - 30 = 10 - 30
-4n = -20 Divide -4 on both sides to get "n" by itself
[tex]\frac{-4n}{-4}=\frac{-20}{-4}[/tex]
n = 5
PROOF
-3(-4n + 30) = -30 Substitute/plug in 5 into "n"
-3(-4(5) + 30) = -30
-3(-20 + 30) = -30 Simplify what's inside the parentheses [PEMDAS}
-3(10) = -30
-30 = -30
A box measure 4 inches long x 7 inches deep x 13 inches high. What's it's volume in cubic inches
Answer:
364 inches cubed
Step-by-step explanation:
Answer:
364 inches cubed
Step-by-step explanation:
Ⓗⓘ ⓣⓗⓔⓡⓔ
Well, the formula for volume is L*H*W
L=4 in, H=13 in, W=7 in
4*13*7=364
(っ◔◡◔)っ ♥ Hope this helped! Have a great day! :) ♥
Find the area for the following figure.
A. 51.06m^2
B. 74.98 m^2
C. 27.14m^2
D. 102.1^2
area = sum of parallel sides . height/2
= (5.9 + 16.3) 4.6/2
= 22.2 . 2.3
= 51.06 m²
so the answer is A
H=-16t^2+ 64+60, Where T is the elapsed time, in seconds
Answer:
The given equation is H = -16t^2 + 64t + 60, where t is the elapsed time in seconds. This equation represents the height, H, of an object thrown upward from the ground with an initial velocity of 64 ft/s.
Step-by-step explanation:
1. The term -16t^2 represents the effect of gravity on the object. Since the coefficient is negative, it indicates that the object is moving upward against the force of gravity. The square of the time, t^2, shows that the effect of gravity increases as time passes. 2. The term 64t represents the initial velocity of the object. The coefficient 64 indicates that the object was thrown upward with an initial velocity of 64 ft/s. The time, t, shows the effect of the initial velocity on the height. 3. The constant term 60 represents any additional height above the ground at the start. It could be the height from which the object was thrown or any elevation from the ground. By plugging different values of t into the equation, you can find the corresponding heights at different times. For example, if you substitute t = 0, the equation becomes H = -16(0)^2 + 64(0) + 60 = 60. This means that at the start (t = 0), the object is at a height of 60 feet above the ground. To find the maximum height reached by the object, we need to determine the vertex of the parabolic equation. The vertex is given by the formula t = -b/(2a), where a and b are the coefficients of t^2 and t, respectively. In this case, a = -16 and b = 64. Substituting these values into the formula, we get t = -64/(2(-16)) = 2 seconds. This means that the object reaches its maximum height after 2 seconds. To find the maximum height, substitute t = 2 into the equation: H = -16(2)^2 + 64(2) + 60 = 64 feet. Therefore, the object reaches a maximum height of 64 feet above the ground after 2 seconds. I hope this explanation helps you understand the meaning of the given equation and how to interpret it in the context of elapsed time and height. Let me know if this helped!
I need help please! Thank you
Answer:
We also know that If two angles are complementary then their sum is equal to 90°. So, two angles ∠1 & ∠2 are complementary.
Step-by-step explanation:
As BA is perpendicular to BC. So, angle ∠ABC is 90°.
We also know that If two angles are complementary then their sum is equal to 90°. As ∠ABC is the sum of the ∠1 & ∠2. In other words, ∠1 & ∠2 are complementary. So, two angles ∠1 & ∠2 are complementary.
Lets prove this.
Given: BA ⊥ BC
Prove: ∠1 & ∠2 are complementary.
Statement Reasons
1. ∠1 & ∠2 are complementary 1. Given
2. ∠1 + ∠2 = 90° 2. Def. of complementary angles
Pretend you are teaching a friend how to find the circumference of a circle. Your friend isn’t even sure they know what circumference is. Write a narrative of what you would say to your friend to explain what circumference is and how you find it.
The circumference of a circle is the distance around the Outside of the circle.
The circumference of found by multiplying PI by the diameter of the circle.
How to get 813 with exponents parentheses in three different operations
Answer:
813 = 800 + 10 + 3 = (8 [tex]\times 10^{2}[/tex] ) + ( 1[tex]\times 10^1[/tex] ) + ( 3 [tex]\times 10^0[/tex] )
Step-by-step explanation:
i) 813 = 800 + 10 + 3 = (8 [tex]\times 10^{2}[/tex] ) + ( 1[tex]\times 10^1[/tex] ) + ( 3 [tex]\times 10^0[/tex] )
in the right triangle shown, ∠B=60° and BC = 2√3
Question:
In the right triangle shown, ∠B=60° and BC = 2√3
How long is AB?
Answer exactly, using a radical if needed.
The image of the triangle is attached below:
Answer:
The length of AB is [tex]4\sqrt{3}[/tex]
Explanation:
It is given that ∠B = 60° and BC = [tex]2\sqrt{3}[/tex]
To determine the length of AB, we shall use the cosine formula.
Because the value of the angle and its adjacent side is given and AB is the hypotenuse, we shall substitute the value of angle and adjacent side in the formula to find the value of AB.
Thus, the formula for [tex]\cos \theta[/tex] is given by
[tex]\cos \theta=\frac{a d j}{h y p}[/tex]
Where [tex]\theta=60[/tex] and [tex]adj= 2\sqrt{3}[/tex] and [tex]hyp=x[/tex]
Substituting these values in the formula, we get,
[tex]\cos 60=\frac{2 \sqrt{3}}{x}[/tex]
Interchanging, we get,
[tex]x=\frac{2 \sqrt{3}}{\cos 60}[/tex]
The value of [tex]cos 60 =\frac{1}{2}[/tex]
Substituting, we get,
[tex]x=\frac{2 \sqrt{3}}{\frac{1}{2} }[/tex]
[tex]x=4\sqrt{3}[/tex]
Thus, the value of x is [tex]4\sqrt{3}[/tex]
Hence, the length of the hypotenuse AB is [tex]4\sqrt{3}[/tex]
Help! Prove the equality
arccos √(2/3) - arccos (1+√6)/(2*√3) = π/6
Answer:
Proof in the explanation
Step-by-step explanation:
Trigonometric Equalities
Those are expressions involving trigonometric functions which must be proven, generally working on only one side of the equality
For this particular equality, we'll use the following equation
[tex]\displaystyle cos(x-y)=cos\ x\ cos\ y+sin\ x\ sin\ y[/tex]
The equality we want to prove is
[tex]\displaystyle arccos\ \sqrt{\frac{2}{3}}-arccos\left(\frac{1+\sqrt{6}}{2\sqrt{3}}\right)=\frac{\pi}{6}[/tex]
Let's set the following variables:
[tex]\displaystyle x=arccos\ \sqrt{\frac{2}{3}},\ y=arccos(\frac{1+\sqrt{6}}{2\sqrt{3}})[/tex]
And modify the first variable:
[tex]\displaystyle x=arccos\ \frac{\sqrt{6}}{3}}=>\ cos\ x= \frac{\sqrt{6}}{3}}[/tex]
Now with the second variable
[tex]\displaystyle y=arccos\ \frac{1+\sqrt{6}}{2\sqrt{3}}=>cos\ y=\frac{1+\sqrt{6}}{2\sqrt{3}}=\frac{\sqrt{3}+3\sqrt{2}}{6}[/tex]
Knowing that
[tex]sin^2x+cos^2x=1[/tex]
We compute the other two trigonometric functions of X and Y
[tex]\displaystyle sin \ x=\sqrt{1-cos^2\ x}=\sqrt{1-(\frac{\sqrt{6}}{3})^2}=\sqrt{1-\frac{6}{9}}=\frac{\sqrt{3}}{3}[/tex]
[tex]\displaystyle sin\ y=\sqrt{1-cos^2y}=\sqrt{1-\frac{(\sqrt{3}+3\sqrt{2})^2}{36}}}[/tex]
[tex]\displaystyle sin\ y=\sqrt{\frac{36-(3+6\sqrt{6}+18)}{36}}=\sqrt{\frac{15-6\sqrt{6}}{36}}[/tex]
Computing
[tex]15-6\sqrt{6}=(3-\sqrt{6})^2[/tex]
Then
[tex]\displaystyle sin\ y=\frac{3-\sqrt{6}}{6}[/tex]
Now we replace all in the first equality:
[tex]\displaystyle cos(x-y)=\frac{\sqrt{6}}{3}.\frac{\sqrt{3}+3\sqrt{2}}{6}+\frac{\sqrt{3}}{3}.\frac{3-\sqrt{6}}{6}[/tex]
[tex]\displaystyle cos(x-y)=\frac{3\sqrt{2}+6\sqrt{3}}{18}+\frac{3\sqrt{3}-3\sqrt{2}}{18}[/tex]
[tex]\displaystyle cos(x-y)=\frac{9\sqrt{3}}{18}=\frac{\sqrt{3}}{2}=cos\ \pi/6[/tex]
Thus, proven
Will make brainliest if answered correctly
Answer:
C(g) = 2.19g ; 2.5
Step-by-step explanation:
Question 1
Since the cost is $2.19 per gallon. For every gallon, the cost will increase by $2.19. Hence, the cost per gallon C(g) is 2.19g.
Question 2
f(1.5) = 3(1.5) - 2
= 4.5 - 2
= 2.5
Answer:
1. C(g) = 2.98g
2. 2.5
Step-by-step explanation:
1. 1 gallon cost $2.98
Therefore y gallon will cost = y2.98 ie C(g) = 2.98g
2. F(x) = 3x — 2
F(1.5) = 3x1.5 — 2 = 4.5 — 2 = 2.5
Find the Quotient.
1,382 divided 4
Answer:
The quotient is 345.5
Step-by-step explanation:
Check image
Final answer:
To find the quotient of 1,382 divided by 4, divide each place value separately. The quotient is 343 with a remainder of 2.
Explanation:
To find the quotient of 1,382 divided by 4, we divide the thousands, hundreds, tens, and ones place separately. Starting from the leftmost digit, we divide 1,382 by 4.
4 divided by 1 is 0 with a remainder of 4. Bring down the next digit 3. So, we have 43. Next, divide 43 by 4. 4 divided by 43 is 10 with a remainder of 3. Bring down the next digit 8. So, we have 38. Finally, divide 38 by 4. 4 divided by 38 is 9 with a remainder of 2.
Therefore, the quotient of 1,382 divided by 4 is 343 remainder 2.