Mean of 10 observations is 8 and that of next 10 observations is 10

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b. you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c. you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d. you spend $5 plus $10 per week until you have less than $45.

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?