M = (8-2)/(4-2) = 3
Therefore the slope is 3 (D).
We can take prime numbers so they don't have a common factor other than 1.
3, and 5.
So we have to list the multiples to find the LCM
3: 3, 6, 9, 12,
15, 18
5: 5, 10,
15, 20, 25
15 is the LCM of 3 and 5
So, you can notice that if two numbers, lets call them a and b, have no common factor, then

is the LCM.
Hope that helped :)
7 1/2 is to the left of 17 2/3 on a number line because 7 1/2 is less then 17 2/3
2.57+4.35=6.92
Tyrone spent $6.92 on paint