2. If f(x) = x2-1, what is the equation for f1(x)?
a. f-'(x)= +VX-1
O
b. f'(x)=1/X-1
c. F-'(x) = +Vx+1
d. x-1(x)= ± √x+1

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.