It would be nice if you can help

How can we find the measure of an exterior angle if we know the measurement of an interior angle

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?

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b