Can y'all help me this question ASAP this all I need

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year