exam Maths Puzzle Numerical Ability

Can someone help solve this?
Let H(t)=4+4sin(pi t/2). Approximate to the nearest hundredth
all values t in the interval [0,4 pi] for which Ht=6.

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exam Other Question

please help me solve this equation:
one pump can fill a tank with oil in 4 hours. a second pump can fill the same tank in 3 hours. if borh pumps are used at the same time, how long will they take to fill the tank. The sum of negative 14,a number, and 6 is -5. What is the number?