Which equation represents the area, y, of the trapezoid​

C.  y =  x^2 + 4x.

Step-by-step explanation:

Area of a trapezoid = (h/2)(a + b)   where h is the altitude and a and b are the lengths of the parallel sides.

So here

Area y  = (x/2)(8 + 2x)

= 8x/2 + 2x^2/2

= 4x + x^2.

lo.lll

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116