Rearrange the formula a2 + b2 = c2 for a. a) a = (c2 − b2)2 b) a = (c2 + b2)2 c) a = c2 − b2 d) a = c2 + b2

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.