The height of a ball in feet is modeled by f(x)= -16x^2 + 80x, which is shown below, where x is the time in seconds after it is hit. How long is the ball in the air? Explain how you know.​

Agraph of a trapezoid can have diagonals with slopes that are negative reciprocals and two pairs of adjacent sides that are congruent, true or false, and why

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?