exam Maths Puzzle Numerical Ability

Elisha invested $12,000 for one year, part at 3% and part at 4 3/4%. If she earned $438.40 in interest, how much was invested at each rate?

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exam Other Question

Find the height and base of a parallelogram given its area = 100 square units, the base = x + 15. f(x)=3x-5/5x+2, f-1(x)= -2x-5/5x-3 I need to find fof-1(x)and f-1of(x)for: -2x-5/5x-3