To raise money for children's charity, a company is selling hot air ballons rides. the cost of going on a ballon ride is a flat rate of $50 plus $15 per hour of flight time. if mrs. beckham plans to donate at most $85,find the number of hours she can spend on a ballon ride.

Three times the sum of a number and seven is negative thirty-six. what is the number?

Solve 3x-18=2y and 5x-6y=6 by elimination show work

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.