book Maths Puzzle Numerical Ability

Suppose a bullet is fired on a distant planet so that its height (in feet) after t seconds is given by h = 4t2(this 2 is an exponet) + 16t + 5

When is the bullet at its heighest

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If a person cross-country skis for 35 minutes, how many calories will be burned?
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Sher 8 hundred dollars is borrowed at an interest rate of 1.5% per month. Find the interest paid over the period os 5 months. --- is it $533.33??
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