4. a) b ) How many factors does 720 have? Prime factor: 720 5 . Determine: GCF(10, 14, 18). 6. Determine LCM (30, 20, 50). Use two different methods. (2 points each/4 points) 7. Ida has two pieces of cloth. One piece is 72 inches wide and the other piece is 90 inches wide. She wants to cut both pieces into strips of equal width that are as wide as possible. How wide should she cut the strips?B. Two runners run around a circular track. The first runner completes a lap in 8 minutes. The second runner completes the track in 19 minutes. If they both start at the same place and the same time and go in the same direction, after how many minutes will they meet again at the starting place? 9. What is the greatest prime number you must consider to test whether 5141 is prime? 10.. Given the following sequence, -3, 9, -27, 81, -243,... a) Give the twelfth number in the sequence b) Give a formula to find the nth term