Paul plans to put concrete on a rectangular portion of a driveway. the portion is 12 feet long and 6 inches high. the price of the concrete is $98.00 per cubic yard. the total cost of the concrete paul needs is $108.89. what is the width of the driveway in feet which paul plans to put concrete?

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.

You have 37 coins that are nickels, dimes, and pennies. the total value of the coins is $1.55. there are twice as many pennies as dimes. find the number of each type of coin in the bank.

How many four digit even numbers can be formed from digits 1,2,3,4,5 if repetition is allowed. how can solve this using permutation formula