exam Maths Puzzle Numerical Ability

Suppose you have 100 feet of fencing that you want to use to enclose the greatest possible rectangular area of your backyard. First, draw three rectangulas of different demensions

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Evaluate.
Find (f+g)(-3) given f(x)=x-4 and g(x)=x-6 Emma Knutt has $10,000 to invest. She would like to earn $980 per year in interest. How much should she invest at 9% if the rest is to be invested at 11%?