I need help thank you

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

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.

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?