exam Maths Puzzle Numerical Ability

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

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exam Other Question

from my graph I am to predict the y value for an x value of -2. I am not sure what to do. which of the following CANNOT be the average ( arithmetic mean) of four positive even integers

A)1
B)2
C)6
D)9
E)12