Math! please help! due asap!!

Part a : solve -vp + 40 < 65 for v part b : solve 7w - 3r = 15 for r show your work .

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=