9. What missing expression makes the equation balance? 5x + 8 + ? = 7x + 2

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?

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square