What is expression is equivalent to 32+24

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?

Could somebody me with this radical simplification?

Mia’s gross pay is 2953 her deductions total 724.15 what percent if her gross pay is take-home pay