At noon, a tank contained 5 cm of water. After several hours, it contained 3 cm of water. What is the percent decrease of water in the tank?

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

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.

Write each rational number in the form a/b, where a and b are integers. 1. 5 1/6 2. -12