Two people can complete 80% of a task in t hours, where t must satisfy the equation t/10 + t/15 = 0.8 How long will it take for two people to complete 80% of the task?

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

Evaluate the expression. (9 + 5)(3 + 2)0