Which of the following situations best describes why excluding the value of a variable from the denominator of an algebraic fraction is necessary? 1)the value of the variable makes the numerator zero. 2)the value of the variable makes both the numerator and denominator zero. 3)the value of the variable makes the denominator zero. 4)the value of the variable makes the fraction equal to zero.

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.