Ray has saved $576 to purchase a lap top computer. this amount is ¾ of the total price of the computer. what is the price of the computer without sales tax? if he has to pay a sales tax of 6%, what is the total cost of the computer? show and explain your work.

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Solve: 25 points find the fifth term of an increasing geometric progression if the first term is equal to 7−3 √5 and each term (starting with the second) is equal to the difference of the term following it and the term preceding it.

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.