exam Maths Puzzle Numerical Ability

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

Please. Thanks.

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exam Other Question

Solve. 27x - 2(8x - 0.905) = 10x + 0.225 Given f(x)=4-3x calculate:

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

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