exam Maths Puzzle Numerical Ability

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?

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exam Other Question
18. Write the equation of the line passing through (-3, -7) and (-3, -6).
A) x = -3
B) y = -3
C) y = x - 3
D) y = x
no book. thanks!!!!! Add the following polynomials:

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