The height of an object is represented by the function h(t)=400-16t^2,where 400 represents the initial height in feet from which the object is dropped and t represents the elapsed time in seconds. How many seconds will it take for object to hit the ground?Answer choices: A. 12.5 seconds
B. 20 seconds
C. 5 seconds
D. 25 seconds

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=