Which relations are functions and which are not functions?

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.

Plz hurry evaluate the expression a+b where a=8 and b=19

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²