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.

Can you simplify 4/7? 24 points will be awarded!

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x