exam Maths Puzzle Numerical Ability

Umm i dont understand how to do this problem at all and my teacher doesnt give help after class.
(4m^2-5m-6)+(3m^2+8m+9)

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exam Other Question

a rectangular solid with a length 8 and width 2 has volume 48. find its height. use common logarithms or natural logarithms and a calculator to evaluate to four decimal places:
log^16 57.2