exam Maths Puzzle Numerical Ability

The sum of negative 14,a number, and 6 is -5. What is the number?

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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. Find the dimensions of a rectangle whose perimeter is 26 meter and whose area is 40 square meters.