exam Maths Puzzle Numerical Ability

I am a little lost on this expression. Divide and simplify
{{{(x^2-49)/x}}}/{{{4f/(25f-125)}}}

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exam Other Question

CAN SOMEONE PLEASE HELP ME WITH THIS PROBLEM:

CONSIDER d(x) = (x + 2)^3 + 3; WHAT IS THE NEW EQUATION FOR d(x) IF IT IS 4 TIMES LARGER? y=(y2 - y1 / x2 - y1)x+b

If you could please show the steps to how you solved this I would appreciate it.

Thanks