evaluate expression for given value 7x=8 WHEN X=2

Answer:

x=27

Step-by-step explanation:

The two angles are vertical angles, which means they are equal

4x+7 = 5(x-4)

Distribute the 5

4x+7 = 5x-20

Subtract 4x from each side

4x+7 -4x = 5x-4x -20

7 = x-20

Add 20 to each side

7+20 =x-20+20

27 = x

For this case we have the following function:

[tex]y = 5-x[/tex]

We look for the points of intersection with the x axis, doing y = 0

[tex]0 = 5-x\\x = 5[/tex]

We look for the points of intersection with the y axis, doing x = 0

[tex]y = 5-0\\y = 5[/tex]

We can also observe that the slope is -1.

[tex]y = mx + b\\y = -x + 5[/tex]

Answer:

See attached image

Answer:

0.5

Step-by-step explanation:

Integers will not include decimals.

Integers are numbers you count with or the opposite of the counting numbers and also 0.

.5 is not a counting number (or the opposite of one or 0) so this is the one that isn't an integer.

Final answer:

Among the options provided, 0.5 is not an integer because it is a decimal number, whereas -22, 75, and 0 are all whole numbers and thus integers.

Explanation:

The question is asking to identify which of the given numbers is not an integer. An integer is defined as any whole number, including negatives, zero, and positive whole numbers. Therefore, out of the options given (0.5, -22, 75, 0), the number 0.5 is not an integer as it is not a whole number but a decimal.

Answer:

Step-by-step explanation:

Calculate the mean (simple average of the numbers).

For each number: subtract the mean. Square the result.

Add up all of the squared results.

Divide this sum by one less than the number of data points (N - 1). This gives you the sample variance.

Take the square root of this value to obtain the sample standard deviation.

Answer:

A

Step-by-step explanation:

EDGE 2020

Answer:

100 toys in 8 hours

Step-by-step explanation:

10x5=50 (4 hours)

THEN

50x2=100 (8 hours)

The toy maker produces 100 toys in 8 hours. This problem may be answered using ratio and proportion or through the factor label method commonly used in Science. It uses equalities given in the problem to help solve an unknown quantity.

Further Explanation:

To get the number of hours produced in 8 hours, use the following relationships given in the problem:

4 hours = 10 boxes

1 box = 5 toys

1. Get the number of boxes of toys produced in 8 hours:

[tex]\frac{4 \ hours}{10 \ boxes} \ = \frac{8 \ hours}{x \ boxes} \\\\x \ boxes \ = \frac{(8 \ hours)(10 \ boxes) }{4 \ hours} \\\\\boxed {x \ = 20 \ boxes}[/tex]

In 8 hours, the toy maker can produce twice as many boxes of toys. Therefore, 20 boxes can me bade in 8 hours.

2. Get the number of toys in 20 boxes:

[tex]no. \ of \ toys = 20 \ boxes (\frac{5 \ toys}{1 \ box})\\ \\\boxed {no.\ of \ toys \ = 100 \ toys}[/tex]

If each box contained 5 toys, then 20 boxes will be equal to 100 toys.

Learn More:

Keywords: ratio and proportion, dimensional analysis

Answer:

6

Step-by-step explanation:

Using the sine ratio in the right triangle

let x = hypotenuse and sin45° = [tex]\frac{\sqrt{2} }{2}[/tex], then

sin45° = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{3\sqrt{2} }{x}[/tex]

and

[tex]\frac{3\sqrt{2} }{x}[/tex] = [tex]\frac{\sqrt{2} }{2}[/tex] ( cross- multiply )

[tex]\sqrt{2}[/tex] × x = 6[tex]\sqrt{2}[/tex]

Divide both sides by [tex]\sqrt{2}[/tex]

x = 6

For this case we have the following equation:

[tex]2x + 5 = -x + (- 1)[/tex]

Below are the correct steps to solve:

We eliminate the parenthesis taking into account that [tex]+ * - = -[/tex]

[tex]2x + 5 = -x-1[/tex]

We add "x" to both sides of the equation:

[tex]2x + x + 5 = -x + x-1\\3x + 5 = -1[/tex]

We subtract 5 from both sides of the equation:

[tex]3x + 5-5 = -1-5\\3x = -6[/tex]

We divide by 3 on both sides of the equation:

[tex]x = \frac {-6} {3}\\x = -2[/tex]

ANswer:

[tex]x = -2[/tex]

Answer:

y - 1 = 2(x + 2)

Step-by-step explanation:

The equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

Here m = 2 and (a, b) = (- 2, 1), thus

y - 1 = 2(x - (- 2)), that is

y - 1 = 2(x + 2) ← in point- slope form

Answer:

Step-by-step explanation:

3 - x = 9        subtract 3 from both sides

3 - 3 - x = 9 - 3

-x = 6             change the signs

x = -6

Answer:

=  1 2

Step-by-step explanation: Brainly?

Answer:

(0.618,4.236) and (-1.618,-0.236)

Step-by-step explanation:

To find the intersection, we are looking for a common point between the curves.

We are solving the system:

[tex]y=x^2+3x+2[/tex]

[tex]y=2x+3[/tex].

I'm going to do this by substitution:

[tex]x^2+3x+2=2x+3[/tex]

Subtract 2x and 3 on both sides:

[tex]x^2+1x-1=0[/tex]

[tex]x^2+x-1=0[/tex]

To solve this equation I'm going to use the quadratic formula:

[tex]x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}[/tex]

To find [tex]a,b,\text{ and }c[/tex], you must compare [tex]x^2+x-1=0[/tex]

to [tex]ax^2+bx+c=0[/tex].

[tex]a=1,b=1,c=-1[/tex].

Now inputting the values into the quadratic formula gives us:

[tex]x=\frac{-1\pm\sqrt{(1)^2-4(1)(-1)}}{2(1)}[/tex]

[tex]x=\frac{-1\pm\sqrt{1+4}}{2}[/tex]

[tex]x=\frac{-1\pm\sqrt{5}}{2}[/tex]

This means you have two solutions:

[tex]x=\frac{-1+\sqrt{5}}{2} \text{ or } x=\frac{-1-\sqrt{5}}{2}[/tex]

It does say approximately.

So I'm going to put both of these in my calculator and I guess round to the nearest thousandths.

[tex]x=0.618 \text{ or } x=-1.618[/tex]

Now to find the corresponding y coordinates, I need to use one the equations along with each x.

I choose the linear equation: y=2x+3.

y=2x+3 when x=0.618

y=2(0.618)+3=4.236

So one approximate point is (0.618,4.236).

y=2x+3 when x=-1.618

y=2(-1.618)+3=-0.236

So another approximate point is (-1.618,-0.236).

On a hot day, the center of the railroad rail would rise approximately 8 millimeters above the ground.

The expansion of the railroad rail can be calculated using the formula:

[tex]\[ \text{Expansion} = \text{Coefficient of Expansion} \times \text{Original Length} \times \text{Change in Temperature} \][/tex]

In this case, the coefficient of linear expansion for steel (commonly used for railroad rails) is approximately[tex]\(0.000012/\degree C\)[/tex], the original length of the rail is 4 kilometers (or 4000 meters), and the change in temperature is the equivalent of 16 centimeters (or 0.16 meters). Plugging these values into the formula:

[tex]\[ \text{Expansion} = 0.000012 \times 4000 \times 0.16 \][/tex]

[tex]\[ \text{Expansion} = 0.768 \, meters \][/tex]

This is the total expansion of the rail. However, we are interested in the rise of the center, which is half of the total expansion. Therefore, the rise of the center is:

[tex]\[ \text{Rise of Center} = 0.5 \times 0.768 \][/tex]

[tex]\[ \text{Rise of Center} = 0.384 \, meters \][/tex]

To convert this into millimeters, we multiply by 1000:

[tex]\[ \text{Rise of Center} = 384 \, millimeters \][/tex]

So, on a hot day, the center of the railroad rail would rise approximately 8 millimeters above the ground. This expansion due to temperature changes is crucial to consider in engineering and construction to prevent issues such as buckling or warping of materials.

Answer:

[tex]V=(\frac{1}{2}x^{3}+x^{2})\ units^{2}[/tex]

Step-by-step explanation:

we know that

The volume of the oblique prism is equal to

[tex]V=BH[/tex]

where

B is the area of the base

H is the height of the prism

Find the area of the triangular base

The area B is equal to

[tex]B=\frac{1}{2}x^{2}\ units^{2}[/tex]

[tex]H=(x+2)\ units[/tex] ---> the height must be perpendicular to the base

substitute

[tex]V=(\frac{1}{2}x^{2})(x+2)[/tex]

[tex]V=(\frac{1}{2})(x^{3}+2x^{2})[/tex]

[tex]V=(\frac{1}{2}x^{3}+x^{2})\ units^{2}[/tex]

Answer:

see explanation

Step-by-step explanation:

Co terminal angles are angle ± 2π, that is

[tex]\frac{11\pi }{8}[/tex] + 2π

= [tex]\frac{11\pi }{8}[/tex] + [tex]\frac{16\pi }{8}[/tex] = [tex]\frac{27\pi }{8}[/tex]

and

[tex]\frac{11\pi }{8}[/tex] - 2π

= [tex]\frac{11\pi }{8}[/tex] - [tex]\frac{16\pi }{8}[/tex] = - [tex]\frac{5\pi }{8}[/tex]

Answer:

Nearly 84°

Step-by-step explanation:

In the attached diagram

So, angle BAC = 120° - 30° = 90°

A parallelogram ABCD is a rectangle, its diagonal vector AD is the sum of vectors AB and AC.

Consider right triangle ABD. In this triangle

[tex]\tan \angle BAD=\dfrac{BD}{AB}=\dfrac{AC}{AB}=\dfrac{7}{5}\\ \\\angle BAD\approx 54^{\circ}[/tex]

So, the sum vector AD has direction 30° + 54° = 84°

I think the correct equation is

c(x) = 200 - 7x + 0.345x^2.

Domain is the set of x-values (i.e. units produced) that are feasible. This is all the positive integer values + 0, in case that you only consider that can produce whole units.

Range is the set of possible results for c(x), i.e. possible costs.

You can derive this from the fact that c(x) is a parabole and you can draw it, for which you can find the vertex of the parabola, the roots, the y-intercept, the shape (it open upwards given that the cofficient of x^2 is positive). Also limit the costs to be positive.

You can substitute some values for x to help you, for example:

x      y

0    200

1    200 -7 +0.345 = 193.345

2    200 - 14 + .345 (4) = 187.38

3    200 - 21 + .345(9) = 182.105

4    200 - 28 + .345(16) = 177.52

5    200 - 35 + 0.345(25) = 173.625

6    200 - 42 + 0.345(36) = 170.42

10  200 - 70 + 0.345(100) =164.5

11 200 - 77 + 0.345(121) = 164.745

The functions does not have real roots, then the costs never decrease to 0.

The function starts at c(x) = 200, decreases until the vertex, (x =10, c=164.5) and starts to increase.

Then the range goes to 164.5 to infinity, limited to the solutcion for x = positive integers.

Answer:

The zero’s have no value since there behind the decimal point. 53.3896 rounded to the nearest 100th can be 55.3900 or 55.39.

Final answer:

Rounding 55.3896 to the nearest hundredth gives you 55.39, as you round up the second decimal place due to the third decimal place being a 9. Trailing zeros after the decimal can usually be dropped.

Explanation:

When rounding 55.3896 to the nearest hundredth, you need to look at the third decimal place, which is the thousandths place in this case. Since the digit in the thousandths place is a 9, which is greater than 5, you round up the second decimal place (hundredths place) by one. So, 55.3896 rounded to the nearest hundredth is 55.39. It is not necessary to write the trailing zeros after the decimal point unless specifically required for formatting reasons, such as in monetary values or certain scientific contexts. When you round a number and end up with zeros at the end like 55.3900, you can typically drop the trailing zeros to get 55.39.

The tower is 75 feet, the wire is 20 feet below the top so the wire is 55 feet above the ground.

The length of the wire is the hypotenuse of a right triangle.

Using the law of cosine:

Cos(angle) = Adjacent leg / Hypotenuse.

Cos(46) = 55 / x

X = 55/cos(46)

x = 79.2 feet

An outside angle is equal to the sum of the two opposite inside angles.

The triangle has an outside angle of 98, it's two opposite inside angles are given as 32 and X.

To find X, subtract 32 from 98.

X = 98 - 32 = 66

The answer is B.

Answer:

(5,-3) if the system is

y=x-8

2x+3y=1

Step-by-step explanation:

I think the system is to read:

y=x-8

2x+3y=1.

Please correct me if I'm wrong.

I'm going to plug 1st equation into 2nd equation giving me:

2x+3(x-8)=1      ->I replaced y with (x-8).

Distribute:

2x+3x-24=1

Combine like terms:

5x-24=1

Add 24 on both sides:

5x=25

Divide both sides by 5:

x=5

If y=x-8 and x=5, then y=5-8=-3.

The solution is (5,-3).

(5, −3) is the solution of given system of equations.

"It is a mathematical statement which consists of equal symbol between two algebraic expressions."

"It is set of equations for which we find a common solution."

"It is a method of solving system of equation we substitute the value of a variable found by one equation in the second equation."

For given question,

We have been given a system of equations.

y = x - 8                ..............(i)

2x + 3y = 1                 ...............(ii)

We use substitution method to solve given system of equations.

Substitute the value of y from (i) to equation (ii).

⇒ x + 3(x - 8) = 1

⇒ 2x + 3x - 24 = 1

⇒ 5x = 1 + 24

⇒ 5x = 25

⇒ x = 5

Substitute above value of x in an equation (i)

⇒ y = 5 - 8

⇒ y = -3

So, the solution of given system of equations is x = 5 and y = -3

Therefore (5, -3) is the solution of given system of equations.

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The value of 5³i⁹ is 125i. This is found by simplifying i to the 9th power to just i and cubing the number 5 to get 125, then multiplying the two together.

To calculate the value of 5³i⁹, we need to understand how to handle complex numbers and exponents. The expression i, known as the imaginary unit, has the property that i² = -1. Keeping this property in mind, we can simplify i⁹ as i⁸ x i¹, where i⁸ is i² raised to the power of 4, which is (-1)⁴ = 1 because any even power of -1 will always equal 1. Therefore, i⁹ simplifies to i. Now, 5³ means that 5 is being cubed, which results in 5x5x5 = 125. Our final step is then to multiply 125 by i, yielding the result 125i.

[tex](g\circ f)(x)=(2x+8)^4\\\\(g\circ f)(-3)=(2\cdot(-3)+8)^4=2^4=16[/tex]

Final answer:

To find (g°f)(-3), we first calculate f(-3) = 2, and then g(2) which equals 16. Therefore, (g°f)(-3) is 16.

Explanation:

The question provided is asking us to compute the composition of two functions, denoted as (g°f)(-3), where f(x) and g(x) are both defined algebraically.

The composition of functions refers to applying one function to the results of another.

To find (g°f)(-3), we first evaluate f(-3) and then use that result as the input for g(x).

Firstly, let's evaluate f(-3):
f(x) = 2x + 8f(-3) = 2(-3) + 8 = -6 + 8 = 2

Now, we evaluate g(2) using the result from f(-3):
g(x) = x⁴g(2) = 2⁴ = 16

Therefore, (g°f)(-3) = g(f(-3)) = g(2) = 16.

Answer:

C

Step-by-step explanation:

Given

- 2 > 5x - 37 ( add 37 to both sides )

35 > 5x ( divide both sides by 5 )

7 > x ⇒ x < 7 → C

Answer:

B

Step-by-step explanation:

The angle on the circumference is half the angle subtended at the centre by the arc CB, that is

∠CAB = 0.5 × ∠COB = 0.5 × 96° = 48° → B

m∠CAB is 48° given that point O is the center of the circle and ∠COB is 96°. This can be obtained by using the circle theorem.

Given that, ∠COB = 96°

By applying Circle theorem, we can say that

                                 ∠COB = 2∠CAB

                                      96° = 2∠CAB

                                 ∠CAB = 96°/2 = 48°

                                 ∠CAB = 48°

Hence m∠CAB is 48° given that point O is the center of the circle and ∠COB is 96°.

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Answer:

25,886 in²

Step-by-step explanation:

The given figure shows 2 circles centered at the same point. We need to find the area of the shaded region. If we observe carefully, the area in between two circles is the shaded region. So if we subtract the Area of smaller circle from the Area of larger circle we can calculate the Area of the shaded region.

Area of a circle = πr²

Radius of larger circle = OP = OQ = 93.4 inches

Radius of smaller circle = OR = OQ - RQ = 93.4 - 71.5 = 21.9 inches

Therefore, area of shaded region will be:

Area of Shaded Region = Area of larger circle - Area of smaller circle

Area of Shaded Region = π(93.4)² - π(21.9)²= 25,886 in²

Thus, the area of shaded region, rounded to nearest inch will be 25,886 in²

Answer:

154.3

Step-by-step explanation:

The measure of each interior angle of a regular polygon with 14 sides is about 154.3.

Answer:

2160°

Step-by-step explanation:

The sum of the interior angles of a polygon is

sum = 180° (n - 2) ← n is the number of sides

here n = 14, thus

sum = 180° × 12 = 2160°

Answer:

x = - 1

Step-by-step explanation:

The equation of the axis of symmetry for a parabola in standard form

y = ax² + bx + c : a ≠ 0 is found using

x = - [tex]\frac{b}{2a}[/tex]

y = - x² - 2x - 5 ← is in standard form

with a = - 1 and b = - 2, thus equation of axis of symmetry is

x = - [tex]\frac{-2}{-2}[/tex] = - 1

Equation of axis of symmetry is x = - 1

Answer: 5

times are properly represented on the chart, the other represents other possible colored teams

Step-by-step explanation:

There are 6 colors in the key, indicating there are at least 6 teams. But we only have a formal data set of 5 of those colors, therefore representing 5 teams.

The number of teams represented by each color in the pie chart are as follows:

Black: 24%, Navy blue: 21%, White: 19%, Gray: 16%, Maroon: 8%, Other: 12%

The pie chart shows that the dominant uniform color in the dataset is black, with 24% of teams represented by that color. This is followed by navy blue (21%), white (19%), gray (16%), and maroon (8%). The remaining 12% of teams are represented by a variety of other colors.

Here is a table showing the number of teams represented by each color:

Color | Number of teams

Black 24%

Navy blue 21%

White | 19%

Gray | 16%

Maroon | 8%

Other | 12%

Please note that the pie chart does not specify the total number of teams in the dataset, so it is not possible to say exactly how many teams are represented by each color. However, we can estimate that approximately 24% of the teams are black, 21% are navy blue, 19% are white, 16% are gray, 8% are maroon, and 12% are represented by a variety of other colors.

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Answer:

Step-by-step explanation:

We have to tell all the spheres are similar. As the spheres has no other configuration except for being perfectly round three-dimensionally

Answer:

A sphere is a three-dimensional solid which only has one contribute, its radius or the axis of the sphere. If you have only one measurement you can compare with another sphere, so no matter what a sphere will always be proportional to the other. This making all spheres to be similar just like circles.

Step-by-step explanation:

Answer:

The product is 25

Step-by-step explanation:

we know that

The complex number z1 is equal to

z1=(-4-3i)

we know that

To find the complex conjugate of (-4 - 3i) we change the sign of the imaginary part

so

The conjugate is equal to (-4+3i)

therefore

[tex](-4-3i)(-4+3i)=16-9(-1)=25[/tex]

Answer:

[tex](-4-3i) (- 4 + 3i) = 25[/tex]

Step-by-step explanation:

Notice in the graph that z1 has a real component of -4 and an imaginary component of -3.

Then we know that:

[tex]z_1 = -4-3i[/tex]

By definition for an imaginary number of the form [tex]a-bi[/tex] its conjugate will always be the number [tex]a + bi[/tex]

So the conjugate of [tex]z_1[/tex] is:

[tex]-4 + 3i[/tex]

The product of both numbers is:

[tex](-4-3i) (- 4 + 3i) = 16-12i + 12i-9i ^ 2\\\\(-4-3i) (- 4 + 3i) = 16-9 (-1)\\\\(-4-3i) (- 4 + 3i) = 16 + 9\\\\(-4-3i) (- 4 + 3i) = 25[/tex]

Answer:

5/7

Step-by-step explanation:

Simplify the radical by breaking the radical up into a product of known factors.

Answer:

[tex]\frac{5}{7}[/tex]

Step-by-step explanation:

You can rewrite the expression as [tex]\frac{\sqrt{25}}{\sqrt{49}}[/tex].

Then you just need to simplify the numerator and denominator. the square root of 25 is 5, and the square root of 49 is 7, therefore the answer is [tex]\frac{5}{7}[/tex]