Find the value of the expression.

7-(-4)=

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?

Abcd is a square. what is the measure of angle bac

Find the value of x. give reasons to justify your solutions! l, m ∈ kn