Which of the following graphs represent a function

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.

Biggest exam of the which of the following are polynomial functions?

Tanyss's house has 25 windows. her brother has washed 22 of the windows. what percent of the windows has her brother washed?