What is the value of x in this equation?
-4x+8 = 42
Use the bubbles in the answer section to mark your answer.
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9)

Answer:

X=37/20

Explanation:

In a kite, one of the diagonals will bisect the other. So, 2(PT)=PR

By substitution, this becomes the equation

2(10x-1)=35

20x-2=35

20x=37

x=37/20

10)

Answer:

Angle TQR is 52 degrees

Explanation:

A kite only bisects one set of opposite angles, so angle TQR is congruent to angle TQP. To find angle TQP use this equation:

Angle TPQ+Angle TQP=90

This is possible because angle QTP is right(diagonals of kites are perpendicular) and because all triangles have interior angles that add up to 180 degrees. The remaining amount of degrees apart from the right angle should be 90 degrees(180-90=90).

Substitute:

38+ angle TQP= 90

Angle TQP= 52 degrees

Angle TQP is congruent to angle TQR, so

Angle TQR=52 degrees

The second one because if you put a mirror image there it would the should look the same

In the second option if you put a mirror image there it would look the same. So, the second one is the correct answer.

A reflection is a phenomenon of change in a direction of the wavefront between two different mediums.

Here, we can see that the first option doesn't show reflection because the music lines are displaced.

In the second option if you put a mirror image there it would look the same.

In the third option, again it doesn't show reflection because the music lines are not the same.

Thus, the second option is the correct answer.

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Answer:

20 cups of onion

Step-by-step explanation:

If your ratio of pepper:onion:tomato is 2:5:8, add up those numbers to get 15.  Onion exists in this ratio as 5cups onion/15cups salsa.  We need to know how much onion in 60cups.  Set up the proportion like this:

[tex]\frac{5}{15}=\frac{x}{60}[/tex]

Cross multiply to get 15x = 300 and x = 20.  If you do the same with the other ingredients, you'll add them together in the end to get a total of 60 cups.

Answer:

The x intercepts are x=-4 and x=2

axis of symmetry x=-1

vertex (-1,-9)

D: {x: all real numbers}

R: {y: y≥ -9}

Step-by-step explanation:

f(x) = x^2+2x-8

y= x^2+2x-8

Factor the equation

What 2 numbers multiply to -8 and add to 2

4*-2 = -8

4+-2 =2

y = (x+4) (x-2)

The x intercepts are found when we set y =0

0=  (x+4) (x-2)

Using the zero product property

x+4=0   x-2 =0

x=-4 and x=2

The x intercepts are x=-4 and x=2

The axis of symmetry is halfway between the x intercepts.  It is symmetric must be in the middle of the x intercepts

1/2 (-4+2) = 1/2(-2) = -1

The axis of symmetry is at x=-1

To find the vertex, it is along the axis of symmetry.  Substitute x=-1 into the equation

y = (x+4) (x-2)

y = (-1+4) (-1-2)

  =3*-3

  =-9

The vertex is (-1,-9)

The domain is the values that x can take

x can be any number

D: {x: all real numbers}

The range is the values that y can take

since the parabola opens upward, the vertex is the minimum,Y must be greater than or equal to -9

R: {y: y≥ -9}

Answer:

10 kgs of 25% copper alloy and 40 kgs of 70% copper alloy

Step-by-step explanation:

Let a be kg of 25% copper alloy, and

b be kg of 70% copper alloy

We can write two equations:

1. a + b = 50

2. 0.25a+0.7b=0.61(50)

We can write #1 as b = 50 - a, and then plug it into #2. We have:

0.25a+0.7b=0.61(50)

0.25a+0.7(50 -  a) = 0.61(50)

0.25a + 35 - 0.7a = 30.5

-0.45a = 30.5 - 35

-0.45 a = -4.5

a = -4.5 / - 0.45

a = 10

Also, b = 50 - a, so b = 50 - 10 = 40

The metalworker should use 10 kgs of 25% copper alloy and 40 kgs of 70% copper alloy to make it.

Answer:

40

Step-by-step explanation:

Answer:

  62 newspapers

Step-by-step explanation:

Let s represent the number of Sunday papers sold. Then s/2 is the number of Friday papers sold. The total revenue is ...

  1.50s + 0.75(s/2) = 116.25

  1.875s = 116.25 . . . . simplify

  s = 116.25/1.875 = 62 . . . . . divide by the coefficient of s

62 Sunday papers were sold.

The mathematical expectation for the number of spaces moved in one turn is:

           A.    3 spaces forward.

Th result or the sample space on spinning a spinner twice is:

           (1,1)    (1,4)    (1,6)    (1,8)

           (4,1)   (4,4)    (4,6)  (4,8)

           (6,1)   (6,4)    (6,6)  (6,8)

           (8,1)   (8,4)    (8,6)   (8,8)

Total number of outcomes= 16

The number of outcomes whose sum is even= 10

( Since the outcomes are: {(1,1) , (4,4) , (4,6) , (4,8) , (6,4) , (6,6) , (6,8) , (8,4) , (8,6) , (8,8)}  )

The number of outcomes whose sum is odd= 6

( Since, the outcomes are: { (1,4) , (1,6) , (1,8) , (4,1) , (6,1) , (8,1) }

Probability(sum even)=10/16

Probability(sum odd)=6/16

Hence, the expectation is:

 [tex]E(X)=\dfrac{10}{16}\times (+6)+\dfrac{6}{16}\times (-2)\\\\\\E(X)=\dfrac{60-12}{16}\\\\\\E(X)=\dfrac{48}{16}\\\\\\E(X)=+3[/tex]

                 Hence, the answer is:

              A.  3 spaces forward.

Answer:

The correct choice is B.

Step-by-step explanation:

The given function is

[tex]f(t)=-\frac{1}{3}\sin (4t-3\pi)[/tex]

The given function is of the form;

[tex]y=A\sin(Bt-C)[/tex]

where

[tex]|A|=|-\frac{1}{3}| =\frac{1}{3}[/tex] is the amplitude.

The period is calculated using the formula;

[tex]T=\frac{2\pi}{|B|}=\frac{2\pi}{|4|}=\frac{\pi}{2}[/tex]

The phase shift is given by;

[tex]\frac{C}{B}=\frac{-3\pi}{4}[/tex]

The correct choice is B

Answer: Option C

[tex]f(x) = x^2;\ k (x) = x ^ 2 -7[/tex]

Step-by-step explanation:

Whenever we have a main function f(x) and we want to transform the graph of f(x) by moving it vertically then we apply the transformation:

[tex]k (x) = f (x) + b[/tex]

If [tex]b> 0[/tex] then the graph of k(x) will be the graph of f(x) displaced vertically b units down.

If [tex]b> 0[/tex] then the graph of k(x) will be the graph of f(x) displaced vertically b units upwards.

In this case we have

[tex]f (x) = x ^ 2[/tex]

We know that this function has its vertex in point (0,0).

Then, to move its vertex 7 units down we apply the transformation:

[tex]k (x) = f (x) - 7\\\\k (x) = x ^ 2 -7[/tex].

Then the function k(x) that will have its vertex 7 units below f(x) is

[tex]k (x) = x ^ 2 -7[/tex]

Answer:

-6r+6

Step-by-step explanation:

8-(6r+2)

8-6r-2

-6r+6

Answer:

-6r +6.

Step-by-step explanation:

Given : 8 - (6r+2) .

To find : Which expression is equivalent .

Solution : We have given 8 - (6r+2) .

Remove the parenthesis

8 - 6r -2.

Combine like terms

-6r +8 -2.

-6r +6.

Therefore, -6r +6.

Answer: A and D are both correct

Step-by-step explanation:

just took this test

In the straightedge and compass construction of the equilateral triangle above, the reasons can be used to prove that AC ≅ BC are:

A. AB and AC are radii of the same circle A, and AB and BC are radii of the same circle, so AB ≅ AC and AB ≅ BC, and AC ≅ BC

D. AB and AC are radii of the same circle and AB and BC are radii of the same circle, so AB ≅ AC and AB ≅ BC. AC and BC are both congruent to AB, so AC ≅ BC.

In Mathematics and Euclidean Geometry, an equilateral triangle can be defined as a special type of triangle that has equal side lengths and all of its three (3) interior angles are equal.

Since lines AB and AC are radii of the same circle and line AB and line BC are radii of the same circle, we can logically deduce that line AB would be congruent with line AC and line AB would be congruent with line BC.

This ultimately implies that line AC and line BC are both congruent to line AB, so based on the transitive property of equality, we have;

AC ≅ BC.

Answer:

D

Step-by-step explanation:

For a function in the form f(x) = x, we can say:

keeping the 2 rules in mind, we can say that

vertical stretch by a factor of 3 would make it f(x) = 3x

Then

flip over x-axis would make it f(x) = -3x

answer choice D is right

Answer:

D. g(x) = -3x

Step-by-step explanation:

The answer is: The third option, the functions cos(θ) and sin(θ) will have negative values for 180°<θ<270°.

To answer the question we must remember where the trigonometric functions have positive and negative values. We can remember it by considerating where the coordinates of any point are positive or negative along the coordinate plane (x and y).

The primary trigonometric functions are:

[tex]sin(\alpha)\\cos(\alpha)[/tex]

Where,

[tex]Tan(\alpha)=\frac{sin(\alpha)}{cos(\alpha)}[/tex]

Also, we need to remember the quadrants of the coordinate plane.

First quadrant: I, 0°<θ<90°

We can find the first quadrant between 0° and 90° , taking the values from 0 to the positive numbers for the x-axis and the y-axis, the points located on this quadrant, will always have positive coordinates, meaning that the functions sine, cosine and tangent will always have positive values.

Second quadrant: II, 90°<θ<180°

We can find the second quadrant between 90° and 180°, taking the values from 0 to the negative numbers for the a-axis, and from 0 to the positive numbers, the points located on this quadrant, will have negative coordinates along the x-axis and positive coordinates along the y-axis, meaning that the function cosine and tangent will always have negative values, while the sine function will always have positive values.

Third quadrant: III, 180°<θ<270°

We can find the third quadrant between 180° and 270°, taking values from 0 to the negative numbers for both x-axis and y-axis, where the points located on this quadrant, will always have negative coordinates along the x-axis and the y-axis, meaning that both functions sine and cosine will always have negative values, while the tangent function will have positive values.

Fourth quadrant: IV, 270°<θ<360°

We can find the fourth quadrant between 270° and 360°, taking values from 0 to the positive numbers for the x-axis, and from 0 to the negative numbers for the y-axis, the points located at this quadrant will always have positive coordinates along the x-axis and negative coordinates along the y-axis, meaning that the sine and tangent function will always have negative values, while the cosine function will always have positive values.

Hence, the answer to the question is the third option, the functions cos(θ) and sin(θ) will have negative values for 180°<θ<270°.

Have a nice day!

Final answer:

For angles between 180° and 270°, the trigonometric functions cosθ and sinθ have negative values while tanθ is positive.

Explanation:

The primary trigonometric functions under consideration are sin, cos, and tan. The question pertains to angles that fall in the third quadrant, specifically for 180° < θ < 270°.

According to the unit circle and trigonometric properties, cosθ and sinθ have negative values in this range.

This is because in the third quadrant, the x-coordinates (cosine values) and the y-coordinates (sine values) are both negative, while the division of two negative values (sinθ/cosθ for tanθ) gives a positive result for tanθ.

Hence, the correct answer is that cosθ and sinθ may have negative values for the specified range of θ.

Answer:

54.1%

Step-by-step explanation:

From the table, the total number of patients with type-B blood is given as 183. On the other hand, the number of males with type-B blood is given as 99. The percentage of patients with type-B blood who are males can be calculated as;

(the number of males with type-B blood/the total number of patients with type-B blood) * 100%;

( 99/183) * 100 = 54.1%

Therefore, the percentage of patients with type-B blood who are males is 54.1

It is B. and i would answer it!!!!!!

HOPE THIS HELP!!!!!! :)

Answer:

a)  60°

b)  60°

Step-by-step explanation:

A regular hexagon can be broken down into 6 equilateral triangles.

*** Note: Attached picture shown.

a)

The angle between two consecutive radii would be taken as EO and OD.

Since all of these 6 angles (of 6 triangles) create a circle, the sum is 360. So each angle (between two radii) would be 360/6 = 60°

b)

To find angle between side and radius of a polygon, let's take the radii as EO and side as ED.

Since we already found the angle between 2 radii to be 60, we have two angle left of a triangle (same size, let's call it x). We know sum of 3 angles in a triangle is 180, thus we can write:

60 + x + x = 180

60 + 2x = 180

2x = 180 - 60

2x = 120

x = 120/2

x = 60°

Answer:

a) Each corral should be 33⅓ ft long and 25 ft wide

b) The total enclosed area is 1666⅔ ft²

Step-by-step explanation:

I assume that the corrals have identical dimensions and are to be fenced as in the diagram below

Let x = one dimension of a corral

and y = the other dimension

(a) Dimensions to maximize the area

The total length of fencing used is:

4x + 3y = 200

4x = 200 – 3y

x = 50 - ¾y

The area of one corral is A = xy, so the area of the two corrals is

A = 2xy

Substitute the value of x

A = 2(50 - ¾y)y

A = 100 y – (³/₂)y²

This is the equation for a downward-pointing parabola:

A = (-³/₂)y² + 100y

a = -³/₂; b = 100; c = 0

The vertex (maximum) occurs at  

y = -b/(2a)  = 100 ÷ (2׳/₂) = 100 ÷ 3 = 33⅓ ft  

4x + 3y = 100

Substitute the value of y

4x + 3(33⅓) = 200

4x + 100 = 200

4x = 100  

x = 25 ft

Each corral should measure 33⅓ ft long and 25 ft wide.

Step 2. Calculate the total enclosed area

The enclosed area is 50 ft long and 33⅓ ft wide.

A = lw = 50 × 100/3 = 5000/3 = 1666⅔ ft²

The maximum area is achieved when the shared fence is 50 feet and the other two sides are 75 feet each, yielding a maximum area of 3750 square feet.

This problem can be solved by the principles of calculus. Assuming that the two corrals share a common side, we can say the total length of fencing is divided into two lengths (x and y). The optimization problem can be formed as follows:

Since the total length available is 200 feet, 2y + x = 200. The area A = xy. Substitute y=(200-x)/2 into the area formula to get a quadratic A = x(200-x)/2. This graph opens downwards, meaning the vertex is the maximum point. The x-coordinate of the vertex of a quadratic given in standard form like Ax^2 + Bx + C is -B/2A. Therefore, x = -B/2A = 200/(2*2) = 50. Substitute x back into y = (200-2x)/2 to get y = 75. So, the maximum area is achieved with a common side of 50 feet and the other sides being 75 feet each.

The maximum area A can be found by substituying these values back into the area formula: A = 75*50 = 3750 square feet.

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Answer:

(2, 4)

Step-by-step explanation:

The center is the midpoint of the diameter.

(x, y) = ((-1 + 5)/2, (5 + 3)/2)

(x, y) = (2, 4)

ANSWER

The center is (2,4)

EXPLANATION

The given circle has a diameter with endpoints of (-1, 5) and (5, 3).

We use the midpoint formula to find the center of the circle

[tex]( \frac{x_1+x_2}{2} ,\frac{y_1+y_2}{2})[/tex]

We plug in the points to obtain;

[tex]( \frac{ - 1+5}{2} ,\frac{5+3}{2})[/tex]

This simplifies to ;

[tex]( \frac{ 4}{2} ,\frac{8}{2})[/tex]

[tex]( 2 ,4)[/tex]

Answer:

Step-by-step explanation:

First you assume some complex number of the form [tex]a + bi[\tex] is the square root of [tex]3 - 4i[\tex].

Then, by the definition, that number squared is 3 - 4i.

And you end up with the following equation:

[tex](a+bi)^2 = 3 - 4i\\a^2 + 2abi - b^2 = 3 - 4i\\(a^2 - b^2) + (2ab)i = 3 - 4i[/tex]

Then you assume the real part of the left is equal to 3 and the complex part [tex]2abi[\tex] is equal to [tex]-4i[\tex].

You end up with a system of equations:

[tex]a^2 - b^2 = 3\\2ab = -4[/tex]

Then you simplify the 2nd equation to [tex]ab = -2[\tex], then you rewrite b in terms of a [tex]b = \frac{-2}{a}[\tex].

You plug your new definition into the first equation and you end up with:

[tex]a^2 - (\frac{-2}{a})^2 = 3\\a^2 - \frac{4}{a^2} = 3[/tex]

You multiply the whole equation by [tex]a^2[\tex] as it is not equal to 0.

[tex]a^4 - 4 = 3a^2\\a^4 - 3a^2 -4 = 0[/tex]

We let [tex]t = a^2[\tex] and we end up with:

[tex]t^2 -3t - 4 = 0\\t_{12} = \frac{3 \pm \sqrt{9 - 4(1)(-4)} }{2} = \frac{3 \pm \sqrt{25}}{2} = \frac{3 \pm 5}{2}\\t_1 = 4\\t_2 = -1[/tex]

We then go back to the definition of [tex]t[\tex]:

[tex]t = a^2\\a^2 = 4 \mid a^2 = -1[/tex]

But since a is a real number we only use the first result:

[tex]a^2 = 4\\a_{12} = \pm 2[/tex]

We then solve for [tex]b[\tex]:

[tex]ab = -2\\b_1 = \frac{-2}{a_1}\\b_2 = \frac{-2}{a_2}\\b_{12} = \pm 1[/tex]

We then write the newly achieved complex number:

[tex]a_1 + b_1i = \sqrt{3-4i} \mid a_2 +b_2i = \sqrt{3-4i} \\2-i = \sqrt{3-4i} \mid -2 + i = \sqrt{3-4i}[/tex].

Use which equation you please to find the magnitude of:

[tex]|X| = \sqrt{2^2 + 1^2} = \sqrt{5}[/tex] - the magnitude.

And to find the phase/angle.

[tex]\theta = arcsin(\frac{b}{\sqrt{a^2+b^2} } ) = arcsin(\frac{1}{\sqrt{5}}) = 26.565^o[/tex]

Answer:

Step-by-step explanation:

1. cos(π) = -1

2. sin(π) = 0

_____

It is useful to memorize the table below.

Answer:

  $18,925.99

Step-by-step explanation:

The sum of n=16 terms of the geometric series with first term a1=800 and common ratio r=1.05 will be ...

  Sn = a1·(r^n -1)/(r -1)

  S16 = $800·(1.05^16 -1)/(1.05 -1) ≈ $18,925.99

Answer: they have saved $18925.99 for his 16th birthday.

Step-by-step explanation:

We know that they save $800 per year, and in each year after the first, they add a 5% extra (0.05 in decimal form).

then, the first year the amount is $800.

the second year, they add $800 + 0.05*$800 = $800*1.05

the third year, they add: $800*1.05 + 0.05*$800*1.05 = $800*(1.05)^2

Now is easy to see that the relation is:

C(n)= $800*(1.05)^(n)

where n goes from 0 to 15, and represents the 16 years in which the parents are saving money.

now, we know that for a geometric series we have:

∑a*r^n = a*( 1 + r^N)/(1 + r)

where the sumation goes from 0 to N -1.

in our case, N - 1 = 15, so N = 16. a = $800 and r = 1.05

then the total of money is;

T = $800*(1 - 1.05^16)/( 1 - 1.05) = $18925.99

Answer:

A should be the answer

Step-by-step explanation:

Answer:

Step-by-step explanation:f(2) = g(2)

Answer:

1440

Step-by-step explanation:

Answer:

Step-by-step explanation:

Let's say we wanted to find the LCM of 6 and 8.

First, write the prime factorization of both:

6 = 2×3

8 = 2³

Let's include all the exponents:

6 = 2¹×3¹

8 = 2³×3⁰

The LCM needs to have the prime factors with the highest exponents.  

So we need prime factors of 2 and 3.  The exponent of the 2 will be three, and the exponent of the 3 will be one.

LCM = 2³×3¹

LCM = 24

Answer:

  y = e^x -4

Step-by-step explanation:

The function has increasing slope so is exponential, not logarithmic. That eliminates the first two choices. The horizontal asymptote is -4, so the function is shifted down 4 units (not 3). The appropriate choice is ...

  y = e^x -4

For this case we have that the area of a regular polygon is given by:

[tex]A = \frac {P * a} {2}[/tex]

Where:

P: It is the perimeter

a: It is the apothem

Since we have a dodecagon, then the perimeter is:

[tex]P = 9 * 12\\P = 108 \ cm ^ 2[/tex]

Then, the area is:

[tex]A = \frac {108 * 16.8} {2}\\A = 907.2 \ cm ^ 2[/tex]

ANswer:

Option B

You cannot divide any number by zero.

When you try to divide something by zero the answer becomes undefined.

Answer:

See below.

Step-by-step explanation:

Dividing  a number  n where n is not zero gives an Undefined result. No matter how many zeros you add together the result is zero - it can never be equal to n.

The expression 0/0 is  referred to as Indeterminate.

Answer:

B) 3/4

Step-by-step explanation:

3 /4

Set A interquartile range = 4

Difference between medians is 3.

Therefore,  3 /4

The difference between the median of set A and set B as a multiple of interquartile range of set A is 3/4.

Set A interquartile range is 4

Difference between their medians is 3

The interquartile range is a measure of the “middle fifty” in a data set in which a range is a measure of the beginning and end are in a set, an interquartile range is a measure of the bulk of the values lie.

Difference between the median = Median / Interquartile range of A

                                                       = 3/4

Thus, the difference between the median set A and set B as multiple of interquartile range is 3/4.

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The correct answer is D) a+2b.

Hope it helps!

Answer:

a + 2b

Step-by-step explanation:

To find the equivalent of the given expression, we must open up the parenthesis by multiplying each element in the parenthesis by 2, we would then collect like terms and simplify the algebraic expression.

2(a + 2b) - a - 2b

= 2a + 4b - a - 2b

= 2a - a + 4b  - 2b

= a + 2b

Answer:

Around 80 of the people will go to the party.

Step-by-step explanation:

If you divide 98 by 100, you find out that 1% of 98 is .98. So after that you multiply that by 82, and the answer is 82% of 98.

Answer:

roughly about 82

Step-by-step explanation: