I've been stuck on this problem for hours

Use circumcenter theorem to solve for the given values

5. (03.02)if g(x) = x2 + 3, find g(4). (2 points)1619811

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.