Jack and walter work in a store's gift-wrapping department. jack can wrap 28 boxes in 2 hours, while walter takes 3 hours to wrap 36 boxes of the same size. one day they work together for t hours to gift wrap 65 boxes. which equation models this situation?

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.