exam Maths Puzzle Numerical Ability

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)?

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exam Other Question
If x to the second= x to the third, give the two possible values for x please help to simplify

4 - 3 times the square root of 3

DIVIDED BY

2 * the square root of 3 - 4