Practice - McGraw-Hill Higher Education

NAME ______________________________________________ DATE______________ PERIOD _____11-7 PracticeRational Expressions with Unlike DenominatorsFind the LCM for each pair of expressions.1. 3a 3 b 2 , 18ab 3 2. w 4, w 2 3. 5d 20, d 44. 6p 1, p 1 5. x 2 5x 4, (x 1) 2 6. s 2 3s 10, s 2 4Find each sum.7 10b 5 b 27. 8. 6x 2 y 3xy24b bn 78 29. 10. n 2 n 6n 2 9 2n 6y 3 3y 2p 1 p11. 12. y 2 16 y 2 8y 16p 2 3p 4 p 42a 6 6a 24h 3 h 213. 14. a 5 a 2 10a 25h 2 6h 9 h 3Find each difference.6p 2pm 4 215. 16. 5x2 3xm 3 m 6s 1 2s 3b 3 317. 18. s 2 9 4s 12b 2 6b 9 b 3t 34t 84y 3y 319. 20. t 2 3t 10 t 2 10t 25y 2 y 6 y 2 421. SERVICE Members of the ninth grade class at Pine Ridge High School are organizinginto service groups. What is the minimum number of students who must participate forall students to be divided into groups of 4, 6, or 9 students with no one left out?Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.22. SAFETY When the Cooper family goes on vacation, they set the house lights on timersfrom 5 P.M. until 11 P.M. The lights come on at different times in each of three rooms:every 40 minutes, every 50 minutes, and every 100 minutes, respectively. The timerturns each of them off after 30 minutes. After 5 P.M., how many times do all the lightscome on at the same time in one evening? at what time(s)?Chapter 11 52 Glencoe Algebra 1