The function f(t) = -3t2 + 18t + 21 models the approximate height of an object t seconds after it is launched. How many seconds does it take the object to hit the ground?

5\16 x 2\5 = 10/80simplify to 1/80

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.

3were boys and 5 were girls