One teacher can grade an exam in 8 hours. The same exam would take a second teacher 12 hour, and a third teacher would take 10 hours. How long would it take for all 3 teachers worked together?

Fa bus driver leaves her first stop by 7: 00 a.m., her route will take less than 37 minutes. if she leaves after 7: 00 a.m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?

In a timed typing test lara typed 63 words per minute.estimate the number of words she should be able to type in half in hour show your work

Javier bought a painting for $150. each year, the painting's value increases by a factor of 1.15. which expression gives the painting's value after 77 years?