book Maths Puzzle Numerical Ability

Isolate for "t": m=16t^2+vt+7
thanks, i cant seem to figure it out... are you supposed to divide it out?

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book Other Question

How do you solve 3(9k-4)-4(5n-3) adam took 7 test scores and divided the correct sum by 6 which yielded 84. what is the correct average test score?