A car salesman models his monthly revenue as a function of time. If his monthly revenue is given by f(x) = 8x + 200. Does this mean that the price is increasing steadily, increasing exponentially, or remaining the same?

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.