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?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

Which equation is true? i. 56 ÷ 4·7 = 82 ÷ (11 + 5) ii. (24 ÷ 8 + 2)3 = (42 + 9)2 neither i nor ii ii only i and ii i only

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters