The Stratosphere Tower in Las Vegas is 921 feet tall and has a 'needle' at its top that extends even higher into the air. A thrill ride called the Big Shot catapults riders 160 feet up the needle and then lets them fall back to the launching pad. The height (in feet) of a rider on the Big Shop can be modeled by h(t) = -16t^2 + vot + 921 where t is elapsed time (in seconds) after launch and vo is the initial velocity (in feet per second).

Question:

Graph h(t), and graph the line y=921. How high are the riders at t=1.5 seconds? t=2.6 seconds?