exam Maths Puzzle Numerical Ability

If the given values in a right triangle are Cos A = 1/3 and a=2, find the
hypotenuse c.

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please help me solve this problem:
Multiply to obtain an equivalent expression
q-2/q+8 * q+3/ q+3 A retail store can sell 20 hard disk drives per week at a price of $400 each. The manager estimates that for each $10 reduction in price, she can sell two more drives each week.