Can someone help with 21 and 22?

What is the measure of angle afe? 79 81 91 99

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

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.