exam Maths Puzzle Numerical Ability

(3x+2y)^2

Is ^2 multiplied by the coefficients and variables?

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BRIAN COSTA DEPOSITED $20,000 IN A NEW SAVINGS ACCOUNT AT 12 % INTEREST COMPOUNDED SEMIANNUALLY. AT THE BEGINNING OF YEAR 4, BRIAN DEPOSITS AN ADDITIONAL $30,000 AT 12 % two runners leave the same point,running in opposite directions .One runneer runs 1 mi/hr faster than the other does.After running for two hours the runneres are 50 miles apart.How fast does each run?
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