PLEASE JUST HELP ME OUT HERE

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

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?