exam Maths Puzzle Numerical Ability

If x to the second= x to the third, give the two possible values for x

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exam Other Question

graph the following equations and give the points

y=2x , y=2x+1
Several values of the two functions f and g are given in the following:

x: 4,5,6,7
f(x): 6,7,4,5

x: 4,5,6,7
g(x): 6,5,7,4

How do I find (f o g)(7)?