How do you find a function on an absolute function graph

Find the solution of this system of equation -7x+y=-20 9x-3y=36

What is 1.5% of 120 or what number is 1.5% of 120

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.