exam Maths Puzzle Numerical Ability

i have to find the volume of a rectangular square pyramid with a base edge 4 and height 6 m.

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exam Other Question

If there were no air resistance, then the height(in feet) above the earth for a skydiver t seconds after jumping from an airplane at 10,000 feet would be given by

h(t) = -16t^2 Please help me solve this problem: -4/8 < 2/3c. I understand how to get the 2/3 on the other side but when I get to the multiplying part I get stuck.