exam Maths Puzzle Numerical Ability

If f(x)=x squared+5, find f(a+h)-f(a)

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exam Other Question

Reciprocal for (-1/5)(20/5))10) How many pounds of hamburger that costs $1.10 per pound must be mixed with 50 pounds of hamburger that costs $1.80 per pound to make a mixture that costs $1.30 per pound?

I came up with 200. Please tell me if I am correct!