An object is thrown upward at a speed of 121 feet per second by a machine from a height of 8 feet off the ground. the height h of the object after t seconds can be found using the equation h = -16t^2+121 t+8
when will the height be 17 feet?
when will the object reach the ground?

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36