exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Can you please help me find the domain and range of this piecewise defined function
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f(x) = { x + 6, {{{ x <= -4 }}} }
.........{ x + 10, {{{ -4 < x < 8 }}} }
.........{ 30, { Find the surface area of a right solid 8 in. high with the base shown as 10" and 4" and 10 in.