Please solve these all questions

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

The sales tax rate is 7.25%. how much tax in dollars is added on an item that costs $56.00? a. $4.06 b. $7.25 c. $14.50 d. $60.06

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )