exam Maths Puzzle Numerical Ability

If soccer ball kicked straight up from the ground with an initial velocity of 32 feet per second, then its height above the earth in feet is given by
s(t)= -16t^2+32t where t is

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I'm not sure how to solve these problems:
-7(√18)-5(√200)-3(√162)

7x^3/7
My Work:
(^7√7x)^3= x^3?

(√p^2-5p+9)= p-2
My Work:
(√p^2-5p 1)A Swimming pool is 50 m long and 20 m Wide . the depths of the two ends are 8m and 3m . so the Shape of the pool is trapezoidal prism . the Water surface is 1m below the top marg