exam Maths Puzzle Numerical Ability

f(x)= x^2+7

find the inverse of this function. is the inverse a function??

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exam Other Question

Determine which two equations represent parallel lines.
(a) y = x + 4
(b) y = x - 7
(c) y = 2x + 8 (d) y = 2x - 4

Thanks. This question is not from a textbook.

the table below show some possible dimensions of rectangles with perimteres of 50 units:

width 2 3 4 5
length 23 22