The function f(x) = 91(.9)x can be used to determine the amount of caffeine remaining in a person's system after drinking a cup of coffee over time. What does the 91 represent?

What are the solution(s) to the quadratic equation x2 – 25 = 0? o x = 5 and x = -5ox=25 and x = -25o x = 125 and x = -125o no real solution

30 ! the graph shows the number of siblings different students have. select from the drop-down menus to correctly complete the statement.

Ken earned $128 from his part-time job this summer. he spent 25% of his money on games. he is going to donate 1/6 of the remaining money to charity. how much money will the charity receive?