70 miles in 2 hours. write as a unit

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

10% of 1,900,000. show me how you got the answer

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?