exam Maths Puzzle Numerical Ability

Can somebody again please help,so many methods and processes to remember, I get them all confused.
PROFESSORS DIRECTIONS:
Make sure to superscript all exponents. Show all factor

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exam Other Question

Solve algebraically using one variable: The perimeter (distance around) of a rectangle is 38 inches and its area (length times width) is 70 square inches. Find the length and the width of this rectangle. Used by itself, the cold water faucet can fill a bathtub in 12 minutes. It takes 15 minutes for the hot water faucet to fill the bathtub. If both faucets are on, how long will it take to fill the bathtub?(round to the nearest .01 minute)