Please simplify x over y^-3

Collin did the work to see if 10 is a solution to the equation r/4=2.4

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

Use order of operations to solve. (24 divided 3) + 3.5 + 3 power of 3