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Cerrena [4.2K]
3 years ago
6

Answer pleaseeeee 15 pts

Mathematics
1 answer:
Nataly_w [17]3 years ago
6 0

Answer:

E

Step-by-step explanation:

89 + 95 = 184

89 x 15% increases the number of boys by 13             89 + 13 = 102

95 x 20% decreases the girls by 19                              95 -  19 =  76

                                                                               102 + 76 + 178

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Write an equation that represents"Four less than the difference of half a number and 3 is 20 ."Use X for the variable.​
Alex73 [517]

Answer:

{(1/2)x-3}-4=20

That is your answer.

8 0
3 years ago
Which quadratic equation has solutions x=8 and x=−1?
andrezito [222]
There are two ways you can do this

Using the formula


{x}^{2}  - (sum \: of \: roots)x + poduct \: of \: roots = 0

{x}^{2}  - (8+-1)x +  - 1 \times 8 = 0


{x}^{2}  - 7x  - 8 = 0


Working backwards


x = 8 \: or \: x =  - 1
\Rightarrow x-8=0  \: or  \: x+1=0

\Rightarrow (x-8)(x + 1)=0
\Rightarrow  {x}^{2}   + x -8x - 8 = 0
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7 0
3 years ago
Which pair of angles are supplementary? ​
PolarNik [594]

Answer: H

Step-by-step explanation:

Supplementary angles just mean they add up to 180 degrees. 180 degrees means that when the two angles are put together one of each of their sides will form a straight line.

6 0
3 years ago
If the terminal side of angle θ passes through a point on the unit circle in the first quadrant where x=√2/2, what is the exact
Serhud [2]

The exact measure of the angle is 45°.

<h3>How to get the angle?</h3>

We know that the terminal side passes through a point of the form (√2/2, y).

Notice that the point is on the unit circle, so its module must be equal to 1, so we can write:

1 = \sqrt{( \frac{\sqrt{2} }{2} )^2 + y^2} \\\\1^2 = \frac{2}{4} + y^2\\1 - 1/2 = y^2\\\\1/\sqrt{2} = y

We know that y is positive because the point is on the first quadrant.

Now, we know that our point is:

(√2/2, 1/√2)

And we can rewrite:

√2/2 = 1/√2

So the point is:

( 1/√2,  1/√2)

Finally, remember that a point (x, y), the angle that represents it is given by:

θ = Atan(y/x).

Then in this case, we have:

θ = Atan(1/√2/1/√2) = Atan(1) = 45°

If you want to learn more about angles, you can read:

brainly.com/question/17972372

3 0
2 years ago
To start a road trip, a car encountered a traffic jam, traveling a total of m miles after the first hour and a total of m2 miles
Monica [59]
56 miles, The car traveled m miles during the first hour and m squared miles during the second hour. The ratio m/m squared = 1/7 and cross multiplying yields m squared = 7m, so m=7. This means that the total distance traveled was 7+7squared = 56 miles
5 0
3 years ago
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