1/cotx(1-cotx)+1/cotx(1-tanx)=1+sec x. cosecx

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

Can someone me and plz do the problem

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.