A plumber has a 10' piece of PVC pipe how many 9/5 foot pieces can be cut from the 10' piece

Do you mind if you guys me with this question i’m on number 8

Maria found the least common multiple of 6 and 15. her work is shown below. multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, . . multiples of 15: 15, 30, 45, 60, . . the least common multiple is 60. what is maria's error?

Which shows a reasonable estimation for 124% of 42 using the distributive property?