exam Maths Puzzle Numerical Ability

if f(x)=x^2+5, find f(a+h)-f(a)

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exam Other Question

11<3x+2<20 two investments were made totaling $15,000. For a certain year these investments yielded $1432 in simple intrest. part of the $15,000 was invested at 9% and part at 10%. find the amount invested at each rate