In Lucy's coin collection, 15% of the coins are quarters. If there are 12 quarters, find the total number of coins in Lucy's coin collection.

Diana is painting statues she has 7/8 of a liter of paint each statue requires 1/20 of a liter of paint how many statues can she paint?

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

Plz ( true - false) all triangles have interior angles whose measure sum to 90.