Simplify the expressions below. Add steps. 1. 2(x + 3) + 4x

2. 4 + 2(x - 2) - 4

3. 6(2x - 4)

4. -6x - 4 + 5x + 7

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.