Two friends, William and Brayden, had just bought their first cars. The equation y=41.5xy=41.5x represents the number of miles, yy, that Brayden can drive his car for every xx gallons of gas. William uses 11 gallons of gas to drive 215.6 miles in his car. How much farther can Brayden's car travel on one gallon of gas than William's car?

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.