exam Maths Puzzle Numerical Ability

Find the surface area of a right solid 8 in. high with the base shown as 10" and 4" and 10 in.

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exam Other Question

A student has grades on three test from the MAT 101 course. The grades are 76, 80, and 72. What must he earn on test 4 to have an average of at least 80? what formula to use when the question states
"For a rectangle where the Perimeter=43cm and the Width=3.4cm, find the length"

also

"Find the Area formula to find the missing dimension of the following rectangle"
A=96m2, l=7.2m, w=?