exam Maths Puzzle Numerical Ability

please i need help with this function f(x)=x^2+5, find f(a+h)-f(a)

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exam Other Question

solve the inequality

3y-4>-37
If A is a 3 × 4 matrix, B is a 4 × 12 matrix, and C is a 12 × 2 matrix, then CBA is:

a. 13,824
b. a 3 × 4 × 12 matrix
c. a 3 × 2 matrix
d. none of the above, these matrices do not match up