What nummber is 20% of 40 % (5 points)

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

This is different from the first one can someone me

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.