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+64t+80. How many seconds will it take to reach ground level?

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exam Other Question

How do you find an equation in slope intercept form of the line satisfying the given condition . . . Find the coordinates of the midpoint of the segment whose endpoints are (-2, 14) and (3, -9)

Help me understand these kinds of problems please? Solve the matrix equation:

|4-5||m|=|32|
|1 2||n |=|-5|

Thank You