exam Maths Puzzle Numerical Ability

Given f(x)=4-3x calculate:

{{{f(x+h) -f(x)}}}/h

Please help, I can't figure this one out at all!

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exam Other Question

(3m-5)(m+7)=0
solve for m.

Please. Thanks. The amount A in an account after t years from an initial principle P
invested at an annual rate r compounded continuously is given by A
= Pert where r is expressed as a decimal.