I dont know what to do​

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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.