If a crew of 6 workers completes a job in 15 hours, how long will it take 10 workers to complete the same job? Let x be the number of hours that 10 workers need to complete the job.

What percent of the circle below is shaded?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*