exam Maths Puzzle Numerical Ability

For f(x) = 2x + 3, find and simplify the expression:

[ f(3+h)- f(3)] / h

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exam Other Question

Rationalize the denominator. Assume that all expressions under radicals represent positive numbers:
(sqrt(r) - sqrt(s))/(sqrt(r)+sqrt(s))

Thank you so very much~ 9p^6-72p^3

factor each polynomial. state prime if needed.