A ball is thrown from an initial height of 5 feet with an initial upward velocity of 21ft/s. The ball's height h (in feet) after t seconds is given by the following. h=5+21t-16t^2
Find all values of t for which the ball's height is 11 feet.

Item 1 which question could the expression 1000n answer? let n = the number of gallons of gas used. how many miles per gallon did the car get driving 1000 miles? let n = the number of grams of food needed for each dog. how many grams of food are needed to feed 1000 dogs? let n = the number of people at the show. how many empty seats were there at the show if there are 1000 seats at the theater? let n = the number of seats at the theater. how many empty seats will there by if 1000 people come to the show?