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3 years ago

Question: How has the U.S. use of renewable and nonrenewable energy sources changed from 2009-2017?

1 answer:

6 0

From 2009 to 2017 energy has changed because in 2009 windmills were used and such things and in 2017 modern energy has been created

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Help me with this one please

galben [10]

Answer:

I think the top and the two in the middle but I can't really see it's a blurry picture

7 0

3 years ago

In a triangle ABC, measure of angle B is 90 degrees. AB is 3x-2 units and BC is x+3. If the area of the triangle is 17 sq cm, fo

Scorpion4ik [409]

Answer:

$x=\frac{8}{3}\ cm$

Step-by-step explanation:

we know that

The area of the right triangle ABC is equal to

$A=\frac{1}{2}(AB)(BC)$

we have

$A=17\ cm^2$

$AB=(3x-2)\ cm$

$BC=(x+3)\ cm$

substitute the values

$17=\frac{1}{2}(3x-2)(x+3)$

$34=(3x-2)(x+3)$

$34=3x^2+9x-2x-6$

$3x^2+7x-6-34=0$

$3x^2+7x-40=0$

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$3x^2+7x-40=0$

$a=3\\b=7\\c=-40$

substitute in the formula

$x=\frac{-7(+/-)\sqrt{7^{2}-4(3)(-40)}} {2(3)}$

$x=\frac{-7(+/-)\sqrt{529}} {6}$

$x=\frac{-7(+/-)23} {6}$

$x=\frac{-7(+)23} {6}=\frac{16}{6}=\frac{8}{3}$

$x=\frac{-7(-)23} {6}=-5$

therefore

The solution is

$x=\frac{8}{3}\ cm$

6 0

2 years ago

Is it possible for an x-intercept and a y-intercept to have no intercept

wel

<span>Not all functions will have intercepts</span>

5 0

3 years ago

Read 2 more answers

What is 298366366×874652882÷727+66377277×863663761-76544

pav-90 [236]

Answer:

5.7686613e+16

Step-by-step explanation:

Use PEMDAS, or the orders of operations, to solve this question.

3 0

3 years ago

Read 2 more answers

Item 12 a rectangular room is 10 feet longer than it is wide. one-foot-by-one-foot tiles cover the entire floor. let ww represen

Svetradugi [14.3K]

Given:

Rectangular room is 10 feet; and

1 x 1 ft tiles

The expression for this problem would be:

If we know that the width is w, while the length is w + 10, therefore the perimeter is 2w + 2 (w + 10), so you need 4w + 20 - 4, or 4w + 16 tiles. Since you do not want to count the corners, twice.

6 0

3 years ago