Is anyone on here 16 or is it just me and only 16 and above

What is the exact volume of the cylinder (radius 13 in., height 30 in.)

Can you me find the missing length. i attached an image.

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.