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

Solve using the square root property:
5x^2=100
5(2*51/2)

Is this correct? How do I solve this problem?

The interest rate on an auto loan in May was 12 3/8%. By September the rate was up to 14 1/4%. How many percentage points did the interest rate increase over the period?

Thanks, She