When using the Unit Circle to find trig values, the sine of an angle is equal to the of it's corresponding point

Astudent simplified a rational expression as shown.

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?

Rewrite the following quadratic functions in intercept or factored form. show your work. y = x^2 + 7x + 10