What is the sum of the polynomials?
(6x+7+ x2)+ (2x - 3)

-x2+6x+4
3x^2 +6x+4
9x + 4
9x^2 +4

Will give brainliest what is the value of x? enter your answer in the box.

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?

Divide. write in the simplest form. 4 1/6 divided by 10