Two mechanics worked on a car. the first mechanic charged $65 per hour, and the second mechanic charged $105 per hour. the mechanics worked for a combined total of 35 hours, and together they charged a total of $2875 . how long did each mechanic work?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

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.

Which of the following equations is equivalent to x/3-6/x=1