How to solve and the answer

C

Step-by-step explanation:

=-[(5x^3+3x^2-7x)+(3x^3-5x^2-2)-(-9x^2+8)]

=-[(5x^3+3x^2-7x)+(3x^3-5x^2-2)+9x^2-8]

=-[(5x^3+3x^3)+(3x^2-5x^2+9x^2)-7x-(2+8)]

=-[8x^3+7x^2-7x-10]

= -8x^3-7x^2+7x+10

-3

step-by-step explanation:

a drawing really does here:

so i draw the horizontal line y=2 and the vertical line x=-2 at this intersection i put b (this is where my right angle is going to be).   so point b is at (-2,2).   point a is 5 units long and is also on y=2 so this point has to be (3,2) or (-7,2) -doesn't matter i will go with (3,2).

now we know c is at (-2,y) we don't know the y yet bet we know that c is on x=-2.

we have the area of the triangle is .5bh=12.5

we know the base length is 5 (ab)

we have the height is (2-y) if you look at your

plug in

.5(5)(2-y)=12.5

solve for y to get the y-coordinate for c

2.5(2-y)=12.5

divide both sides by 2.5 giving:

2-y=5

now subtract 2 on both sides

-y=3

y=-3