A substance's decay function is represented by the equation y = 10(0.87)", where = is in hours. How long will it take until only 2.5 units of the substance is left? Justify your reasoning.

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

Point r divides in the ratio 1 : 3. if the x-coordinate of r is -1 and the x-coordinate of p is -3, what is the x-coordinate of q? a. b. 3 c. 5 d. 6 e. -9

How do i take any fraction and make it into a decimal or percentage?