The height of a pop fly ball over the time after the ball is hit is modeled by the function h(t) = -16t²+81t+5 where h(t) is the ball's height in feet above the ground and t is the time in seconds after the ball is hit. In how many seconds will the ball reach its maximum height?

The measure of an angle is 117°. what is the measure of a supplementary angle?

Which expression is equivalent to 16 in exponential form? a) 4 × 4 b) 8 × 2 c) 23 d) 24

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14