Ihave to divide and multiply integers

Which expression is equivalent to 2x^2+7x+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?

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer