Kelly has saved $35 to take music classes. She must pay a registration fee of $15 and then an additional $5 for each class. Which equation will best help Kelly determine the number of classes she can afford? 15c - 5 = 35
15c - 5 = 35

5c - 15 = 35
5c - 15 = 35

5c + 15 = 35
5c + 15 = 35

15c + 5 = 35
15c + 5 = 35

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

Explain how you can use the associative property to evaluate (7x50)x4.

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.