Can someone help me? I’ll reward points + brainalist

B

Step-by-step explanation:

Since the only difference in the aquariums is the length, you can find the difference by multiplying the difference in length with the rest of the dimensions.

Difference in length = 4ft - 3ft

                                 = 1ft

Difference in volume = 1ft × 2ft × 1ft

                                   = 2ft³

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

care to share were the trapezoid shown is ?