Answer:
C. b = 34
Step-by-step explanation:
Given
-b+21= -13
To solve this type of equations that only involve one variable, we have to isolate the variable at on side of the equation. So, for the given equation
We will subtract 21 from both sides
-b+21-21=-13-21
-b= -34
As the minus sign is on both sides of the equation, it will be cancelled and
b=34
So, option C is the correct answer ..
Find the volume of the cone with the given dimensions: d = 26 cm, h = 10 cm
Answer:
¹⁶⁹⁰/₃π cm³ ≈ 1769.76 cm³
Step-by-step explanation:
Equation of a volume of a cone: V = ¹/₃ * πr²h
1. Find r (radius): r = d/2 = 26/2 = 13 cm
2. Plug in everything into equation: V = ¹/₃ * π(13)² * 10
3. Square: V = ¹/₃ * π * 169 * 10
4. Multiply: V = ¹⁶⁹⁰/₃π cm³ ≈ 1769.76 cm³
if it has a diameter of 26 cm, then its radius is half that, or 13.
[tex]\bf \textit{volume of a cone}\\\\ V=\cfrac{\pi r^2 h}{3}~~ \begin{cases} r=radius\\ h=height\\ \cline{1-1} r=13\\ h=10 \end{cases}\implies V=\cfrac{\pi (13)^2(10)}{3} \\\\\\ V=\cfrac{1690\pi }{3}\implies V\approx 1769.76[/tex]
A teacher divided the class into two groups of equal size. 3/5 of the first group are right-handed. 80% of the second group are right-handed.
What fraction of the class is right handed??
Answer:
7/10
Step-by-step explanation:
To make things simple, let's turn 80% into a fraction, 8/10. To get a common denominator let's turn 8/10 into 4/5. Since they are both of equal size, the first group would have 2/5 left-handed people and the second 1/5 left-handed people. Let's imagine that each group has 5 people in it. There would be 10 people in total. There is 1 person for each fifth so we can add now. 4 + 3 = 7 right handed people. To check, 2 + 1 = 3 and 3 + 7 = 10. so 7/10 of the class is right-handed.
The fraction of the class is right handed is 7/10
We have given that
80% of the second group are right-handed.
let's turn 80% into a fraction,
What is the fraction form of 80%?The fraction form of 80% can be calculated by dividing 80 by 100
So we get,
[tex]=\frac{80}{100} \\\\=\frac{8}{10}[/tex]
=8/10.
To get a common denominator let's turn
8/10 =4/5 .....(divide the numerator and denominator by 2)
Since they are both of equal size,
The first group would have 2/5 left-handed people and
The second 1/5 left-handed people.
Let's imagine that each group has 5 people in it.
There would be 10 people in total.
There is 1 person for each fifth so we can add now.
4 + 3 = 7 .....(1)
right handed people.
we can check it,
2 + 1 = 3 and 3 + 7 = 10. .........(2)
Therefore we get,
7/10 of the class is right-handed.
The fraction of the class is right handed is 7/10
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7. Jackie has one red pencil, one yellow pencil, one blue pencil,
one green pencil, one orange pencil, and one purple pencil. She
also has one red pen, one blue pen, and one black pen. If Jackie
randomly selects one pencil and one pen, what is the probability
that she will select a purple pencil and a black pen in that order?
Answer:
I believe it is 1/6 for the pencil and 1/3 for the pen. Altogether, 2/9.
Step-by-step explanation:
There is 1 purple pencil out of 6 and 1 black pen out of 3.
Using probability of independent events, it is found that there is a [tex]\frac{1}{15}[/tex] probability that she will select a purple pencil and a black pen in that order.
A probability is the number of desired outcomes divided by the number of total outcomes.
If two events, A and B, are independent, the probability of both happening is the multiplication of the probabilities of each happening, that is:
[tex]P(A \cap B) = P(A)P(B)[/tex]
In this question:
The pencil and the pen are independent.One of the five pencils are purple, thus [tex]P(A) = \frac{1}{5}[/tex].One of the three pens are black, thus [tex]P(B) = \frac{1}{3}[/tex].The probability is:
[tex]P(A \cap B) = P(A)P(B) = \frac{1}{5} \times \frac{1}{3} = \frac{1}{15}[/tex]
[tex]\frac{1}{15}[/tex] probability that she will select a purple pencil and a black pen in that order.
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Which of the following represents the factored form of f(x) = x3 − 81x? f(x) = x(x − 9)2 f(x) = (x + 9)(x − 9) f(x) = x(x + 9)(x − 9) f(x) = x(x2 − 9)
Answer:
f(x) = x(x + 9)(x − 9)
Step-by-step explanation:
Answer: f(x) = x(x+9)(x-9)
Step-by-step explanation:
On monday ,248 students went on a trip to the zoo.All 4 buses were filled and 8 students had to travel in in cars. How many students were in each bus?
Answer:
60 students were in each bus.
Step-by-step explanation:
248-8=240
240 students rode on busses.
240/4= 60
60 students per bus.
248-8= 240 (taking away 8 because 8 of the students are not taking the bus)
240/4=60 (dividing the number we got by 4 because there are 4 busses)
i hope i helped :)
How does the graph of g(x)=3x-2 compare to the graph of f(x)=3x
Answer:
Step-by-step explanation:
the graph of f(x)=3x becomes the graph of g(x)=3x-2 if the entire graph of f(x) = 3x is translated down by 2 units.
a box has a length of 12 inches and a width of 10 inches . If the volume of the box is 960 cubic inches. What is it's height?
length* width
12*10= 120
Volume /120
960/120=8
height is 8 inches
Two numbers are of the ratio 3:5. If their difference is 18, find the numbers.
[tex]x \div y = 3 \div 5 \\ it \: means = \\ 3y = 5x \\ x - y = 18 \\ [/tex]
To solve we multiply the last equation by 5 and we get the following:
5x-5y=90
But 5x=3y and we replace it in this equation:
3y-5y=90
-2y=90
y=-45
and x-(-45)=18 , x+45=18
x=-27
Use DeMoivre's Theorem to write the complex number in standard form.
Answer:
A
Step-by-step explanation:
First express [tex]\sqrt{2}[/tex] + i[tex]\sqrt{2}[/tex] in trig form
| z | = [tex]\sqrt{(\sqrt{2})^2+(\sqrt{2})^2 }[/tex] = [tex]\sqrt{4}[/tex] = 2
Θ = [tex]tan^{-1}[/tex]( [tex]\frac{\sqrt{2} }{\sqrt{2} }[/tex]) = [tex]tan^{-1}[/tex]( 1) = [tex]\frac{\pi }{4}[/tex]
Thus
[tex]\sqrt{2}[/tex] + i[tex]\sqrt{2}[/tex] = 2 [ cos[tex]\frac{\pi }{4}[/tex] + isin[tex]\frac{\pi }{4}[/tex] ]
Hence
([tex]\sqrt{2}[/tex] + i[tex]\sqrt{2}[/tex] )³
= 2³ [ cos ([tex]\frac{\pi }{4}[/tex] × 3) + isin([tex]\frac{\pi }{4}[/tex] × 3 ) ]
= 8 [ cos([tex]\frac{3\pi }{4}[/tex] ) + isin([tex]\frac{3\pi }{4}[/tex]) ] → A
The standard form of the give complex number is
8 [ cos(\frac{3\pi }{4} ) + isin(\frac{3\pi }{4}) ]
We have given that,
First express [tex]\sqrt{2} + i\sqrt{2}[/tex] in trig form
[tex]| z | = \sqrt{(\sqrt{2})^2+(\sqrt{2})^2 } = \sqrt{4} = 2[/tex]
[tex]\theta = tan^{-1}( \frac{\sqrt{2} }{\sqrt{2} }) = tan^{-1}( 1) = \frac{\pi }{4}[/tex]
Thus, [tex]\sqrt{2} + i\sqrt{2} = 2 [ cos\frac{\pi }{4} + isin\frac{\pi }{4} ][/tex]
What is the Demoivre's theore?[ r(cos θ + i sin θ) ]^n = r^n(cos nθ + i sin nθ)
Hence, [tex](\sqrt{2} + i\sqrt{2} )^3[/tex]
[tex]= 2^3 [ cos (\frac{\pi }{4} \times 3) + isin(\frac{\pi }{4} \times 3 ) ][/tex]
[tex]= 8 [ cos(\frac{3\pi }{4} ) + isin(\frac{3\pi }{4}) ] \implies A[/tex]
Thererefore the standard form of the give complex number is
8 [ cos(\frac{3\pi }{4} ) + isin(\frac{3\pi }{4}) ].
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Need help please.
Chantale wants to make a graph of her walk home from school yesterday.
A. She walked toward home from school.
B. She ran back to school to get a notebook she forgot.
C. She spent 2 minutes at school getting her notebook.
D. She walked all the way back home.
Drag a segment to each box to show the shape of the graph for that interval.
Answer:
See diagram below
Step-by-step explanation:
I added the picture but not sure if you can see it? Hope it helps!
Final answer:
Chantale's motion can be graphically represented on a position-time graph, with walking segments shown by lines with positive slopes, the running back segment by a line with a negative slope, and the stationary segment at school by a horizontal line.
Explanation:
The question pertains to plotting a graph of Chantale's motion as she moves to and from school, which is a concept from kinematics in physics. We can visualize her walk as a position-time graph, where each part of her travel (A to D) corresponds to a different segment of the graph.
A. Walking towards home: This would be represented by a line moving away from the origin (assuming the school is the origin) with a positive slope, showing that distance from school is increasing over time.
B. Running back to school: This segment of the graph will have a negative slope as Chantale moves closer to the origin (school).
C. Spending 2 minutes at school: During this time, her position does not change, so the graph will show a flat, horizontal line indicating no movement.
D. Walking back home: This would again be a line with a positive slope as she moves away from the school to her house.
To encompass the entire journey, you would see a graph with segments that reflect these motions, and each segment would follow the order of actions A to D.
Identify the property used in this equation:
3 + [7 + (–4)] = (3 + 7) + (– 4)
Answer:
Associativity property of Addition
Step-by-step explanation:
The associate property defines that grouping of more than two numbers and performing the basic arithmetic operations of addition and multiplication does not affect the final result. Note that grouping means placing the parenthesis.
The property used in this equation is the associative property of addition.
What is the associative property of addition?Associative property states that changing the order in which addends are grouped has no effect on the sum.
(a + b) + c = a + (b + c)
The equation given in the question is:
3 + [7 + (–4)] = [3 + 7] + (– 4)
The associative property states that (a + b) + c = a + (b + c)
Both equations are matching.
Hence, the equation given in the question clearly follows the associative law of addition.
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Brainliest + Points
Can someone please help?
See the attached picture.
The Y values would remain the same, the X values become the negative of the original values.
Graph the line Y=2/3x-1
Since this is a linear question in y=mx+b form, and where m is the slope of the line and b is the y-intercept....
The slope in this problem is 2/3
And y intercept is -1
So you would graph the point -1 on y axis then go up 2/3 since it’s positive( go up 2 over 3)
please help i will give brainliest!
Which statement is best represented by the inequality p>48?
1.The basketball team scored less than 48 points.
2.The basketball team scored 48 fewer points than last year’s team.
3.The basketball team scored greater than 48 points.
4.The basketball team scored exactly 48 points.
Answer:
2.
Step-by-step explanation:
The reason I say this one is because that equation say p is greater than 48 that is why,
Answer: Option number 3!
What are the zeros of the function f(x)=x^3+x^2-6x
PLEASE HELP ASAP!!
Answer:
A
Step-by-step explanation:
Given
x³ +x ² - 6x ( to find the zeros equate to zero ), that is
x³ + x² - 6x = 0 ← factor out x from each term
x(x² + x - 6) = 0
To factorise the quadratic
Consider the factors of the constant term (- 6) which sum to give the coefficient of the x- term (+ 1)
The factors are + 3 and - 2, since
3 × - 2 = - 6 and 3 - 2 = + 1, hence
x(x + 3)(x - 2) = 0
Equate each factor to zero and solve for x
x = 0
x + 3 = 0 ⇒ x = - 3
x - 2 = 0 ⇒ x = 2
The zeros are x = - 3, x = 0, x = 2 → A
A company dyes two sizes of rugs. A small rug requires 8 hours for dyeing and a medium-size rug requires 12 hours for dyeing. The dyers have to make at least 22 rugs, and they must do it in less than 240 hours. Let x equal small rugs and y equal medium rugs. Which of the following inequalities can be paired with x + y ≥ 22 to create a system that represents this situation?
8x + 12y > 240
12x + 8y > 240
8x + 12y < 240
12x + 8y < 240
Answer:
8x + 12y < 240
Step-by-step explanation:
If x equals the number of small rugs and y equals the number of medium rugs dyed, we would need to multiply both variables by the number of hours taken to dye each sized rug. It takes 8 hours to dye a small rug (8x), and 12 hours to dye a medium rug (12y).
Then, to find the total number of hours they dye them in, add the terms together.
8x + 12y
The company must dye the rugs in less than 240 hours, so we will use a 'less than' (inequality) sign (it cannot be 240, or any more than 240).
8x + 12y < 240
Answer:
c
Step-by-step explanation:
CAN SOMEONE HELP ME SOLVE THIS
Answer:
60
Step-by-step explanation:
Answer:
x = 60°
Step-by-step explanation:
The sum of the 3 angles in a triangle = 180°, thus
x + x + x = 180
3x = 180 ( divide both sides by 3 )
x = 60
The triangle is equilateral
What is the absolute value of
|-14|
|-16|
Answer:
14 and 16
Step-by-step explanation:
absolute value of a negative is the positive
Answer:
Answer is 14 and 16.
Step-by-step explanation:
Absolute value is never negative.
Hope my answer has helped you!
Solve the inequality.
x + 11 > 2
Let's solve your inequality step-by-step.
x+11>2
Step 1: Subtract 11 from both sides.
x+11−11>2−11
x>−9
Answer:
x>−9
Ok I’m sorry I’m dumb but I really need help so if y’all can help me that would be amazing
Answer:
498
Step-by-step explanation:
38×12 + 7×6 = 498
don't worry!
Answer: B 498
Step-by-step explanation:12 times 38 because it is 12 eggs in each cartons plus 7 times 6 because she also bought 7 quail eggs equal to 498
a graphic designer chose a base font size and represented it as 1 on the scale. he then listed some consecutive scale sizes. two consecutive sizes were 5.832 and 10.4976.
what scale size came before 5.832 ?
Answer:
3.24
Step-by-step explanation:
You would use the two fonts given to find the scale factor.
So the scale factor would be 10.4976/5.832 = 1.8
So if the scale factor is 1.8 we can use that to find the font size just before that. To do this you would divide the font size by the scale factor.
So
5.832/1.8 = 3.24
The font size just before 5832 is 3.24.
Hope this helps, if there is an error in my work please correct me.
Which graph represents a reflection of f(x) = 2(0.4)x across the y-axis?
Answer:
The graph in the attached figure
Step-by-step explanation:
we know that
In a reflection across the y-axis the y-coordinate remains the same, but the x-coordinate is transformed into its opposite
we have
[tex]f(x)=2(0.4)^{x}[/tex]
The reflection of f(x) across the y-axis is equal to the function g(x)
[tex]g(x)=2(0.4)^{-x}[/tex]
The graph in the attached figure
The graph which best represents a reflection of f(x) across the y-axis is; f(x) = 2(0.4)^-x.
[tex]f(x) = 2(0.4)^{-x}[/tex]
What is the reflection of the graph of the function?A reflection of a point over the y -axis is given by a rule in accordance with mathematical convention. The rule in discuss for a reflection over the y -axis is (x,y)→(−x,y).
Hence, the reflection of the graph is given by the function; f(x) = 2(0.4)^-x.
[tex]f(x) = 2(0.4)^{-x}[/tex]
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Two cars are 400 miles apart when they start moving towards each other. The speed of the first car is 30 mph. The second car moves 20mph faster than the first car. After how many our will the cars meet
Answer:
5 hr.
Step-by-step explanation:
this is because one car is moving at 30 miles an hour and the other at 30+20 miles an hour = 50mph. so after 1 hour one car would have gone 30 miles and the other 50 = 80 altogether not 400 yet. After 2 hours one car would have gone 60 miles and the other 100 = 160 not 400 yet. ECT... After five hours one car has gone 150 mile (30mph*5hr = 150miles) and the other 250miles (59mph*50hr = 250miles) = 400, since 150+250=400. Therefore it would take 5hr for the cars to meet. and crash ._.
Final answer:
The two cars traveling towards each other, one at 30 mph and the other at 50 mph, will meet after 5 hours, since their combined speed is 80 mph and they are 400 miles apart.
Explanation:
To solve the problem of when two cars moving towards each other will meet, we can use the concept of relative speed. The first car travels at 30 mph, and the second car travels at the faster speed of 50 mph (since it is 20 mph faster than the first car). The combined speed at which the two cars are moving towards each other is the sum of their individual speeds.
The formula for time is:
Time = Distance / Speed
Given that the two cars are 400 miles apart, and the combined speed is 30 mph + 50 mph = 80 mph, the time it takes for the two cars to meet is:
Time = 400 miles / 80 mph = 5 hours
Therefore, the cars will meet after 5 hours of travel.
If the endpoints of have the coordinates A(9, 8) and B(-1, -2), what is the midpoint of AB?
A.
(5, 3)
B.
(4, 5)
C.
(5, 5)
D.
(4, 3)
For this case we have that by definition, the formula of the midpoint is given by:
[tex]MP = (\frac {x_ {1} + x_ {2}} {2}, \frac {y_ {1} + y_ {2}} {2})[/tex]
We have the points are:
[tex](x_ {1}, y_ {1}) :( 9,8)\\(x_ {2}, y_ {2}): (- 1, -2)\\MP = (\frac {9 + (- 1)} {2}, \frac {8 + (- 2)} {2})\\MP = (\frac {9-1} {2}, \frac {8-2} {2})\\MP = (\frac {8} {2}, \frac {6} {2})\\MP = (4,3)[/tex]
Answer:
Option D
Answer:
option D is right on plato
Step-by-step explanation:
an electric motor makes 3000 revolution per minutes how many degrees does it rotate in a second
Answer: 18,000deg
Step-by-step explanation:
(3000rev/min)*(1min/60s)*(360deg/1rev)=18,000deg
Answer:
18,000
Step-by-step explanation:
We know that the electric motor makes 3000 revolutions in a minute/60 sec.
In one second, the motor makes 3000/60 revolutions.
In one second, the motor makes 50 revolutions.
∴ 1 revolution = 360 degrees
50 revolutions = 360 × 50 degrees
50 revolutions = 18,000 degrees
In this triangle, what is the value of x?
Enter your answer, rounded to the nearest tenth, in the box.
x = ____ km
Answer: [tex]x=56.5\ km[/tex]
Step-by-step explanation:
Given the right triangle in the image, you need to remember the following identity:
[tex]cos\alpha=\frac{adjacent}{hypotenuse}[/tex]
Observe the triangle. You can identify that:
[tex]\alpha=28\°\\adjacent=x\\hypotenuse=64[/tex]
Then, knowing these values, you can substitute them into [tex]cos\alpha=\frac{adjacent}{hypotenuse}[/tex]:
[tex]cos(28\°)=\frac{x}{64}[/tex]
Finally, you have to solve for "x".
Therefore, the value of "x" rounded to the nearest tenth is:
[tex]64*cos(28\°)=x\\x=56.5\ km[/tex]
018-2019) Q4
Describing the structure on the TTO
HE
Multiplying a trinomial by a trinomial follows the same
steps as multiplying a binomial by a trinomial. Determine
the degree and maximum possible number of terms for
the product of these trinomials: (x2 + x + 2)(x2 – 2x + 3).
Explain how you arrived at your answer.
Answer:
[tex]\boxed{\text{Degree = 4; Max. no. of terms = 5}}[/tex]
Step-by-step explanation:
(x² + x + 2)(x² – 2x + 3)
1. Degree of product
The degree of the product of two polynomials is the sum of their degrees.
Each polynomial is of degree 2, so the degree of the product is 4.
That is, the term of highest degree must come from x² × x² = x⁴.
2. Maximum number of terms
The maximum number of terms is one more than the degree of the product.
Thus, there is a maximum of five terms in the product: one for each power of x plus a constant term.
P = a₁x⁴ + a₂x³ + a₃x² + a₄x + a₅
The theoretical probability of an event occurring is 2/5
which best describes the experimental probability associated with this
A)Out of every 5 trials, the desired outcome will occur exactly 2 times
B)Out of every 5 trials the desired outcome will occur approximately 2 times
C)Out of every 7 trials, there will be 2 desired outcomes and 5 undesired outcomes
D)
Out of every 7 trials, there will be 5 desired outcomes and 2 undesired outcomes
Answer:
The answer is B. Hope this helped! c;
Step-by-step explanation:
Answer:
B)Out of every 5 trials the desired outcome will occur approximately 2 times
Step-by-step explanation:
The theoretical probability of an event occurring is 2/5. Which best describes the experimental probability associated with this?
The answer is -
Out of every 5 trials, the desired out come will be approximately 2 times.
Theoretical probability is based on reasoning. It is written as a ratio of the number of favorable outcomes to the number of possible outcomes.
Someone please help me!
Answer:
ΔAGB ≅ ΔCGBStep-by-step explanation:
Look at the picture
A counterexample for the expression sinx+cosx=1 is 45 degrees T or F
True
Step-by-step explanation:A counterexample is a special type of example that is an exception to a general rule, law, proposition or statement. Hence if we prove that [tex]sin(45^{\circ})+cos(45^{\circ})\neq 1[/tex] then this is a counterexample for the expression [tex]sin(x)+cos(x)=1[/tex]. Thus:
[tex]sin(x)+cos(x)=1 \\ \\ Substituting \ x=45^{\circ} \ we \ have: \\ \\ sin(45^{\circ})+cos(45^{\circ})=1 \\ \\\frac{\sqrt{2}}{2}+\frac{\sqrt{2}}{2}=1 \\ \\ Rewriting:\\ \\2\frac{\sqrt{2}}{2}=1 \\ \\ \therefore \sqrt{2}=1 \ FALSE![/tex]
So we observe that the equation is not fulfilled because [tex]\sqrt{2}\neq 1[/tex]. In conclusion:
A counterexample for the expression sin(x)+cos(x)=1 is 45° is true!