exam Maths Puzzle Numerical Ability

Add the following polynomials:

(5b^3 - 8b + 2b^2) + (3b^2 - 7b^3 + 5b)

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exam Other Question

An object is projected upward from the top of a tower. Its distance in feet above the ground after t seconds is given by s(t)=16t^2+64t+80. How many seconds wil it take to reach ground level? Eight students signed up to play doubles tennis. The coach wants to try all possible two player teams to find the best combination. How many different teams are there.
r u serially cereal serious it is 8*8 noob