What do you mutiply when doing surface area

Depends on the shape for rectangles its base × height for triangles its base × height × 1/2

y=−9/2x+10

step-by-step explanation:

let's solve for y.

0−9x−2y=−20

step 1: add 9x to both sides.

−9x−2y+9x=−20+9x

−2y=9x−20

step 2: divide both sides by -2.

−2y

−2

=

9x−20

−2

y=

−9

2

x+10

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8