On the morning of the sale, the store donates 50 pairs of shoes to the homeless shelter. Then they sold 64% of the remaining inventory during the sale. If the store had 288 pairs after the donation and the sale, how many pairs of shoes did they have at start?

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?