Awinery has a vat with two pipes leading to it. the inlet pipe can fill the vat in 44 ? hours, while the outlet pipe can empty it in 77 hours. how long will it take to fill the vat if both pipes are left? open?

As a manufacturer of golf equipment, the spalding corporation wants to estimate the proportion of golfers who are left-handed. how many golfers must be surveyed if we want 99% confidence that the sample proportion has a margin of error of 0.025? assume that a previous study suggests that 20% of golfers are left-handed.