Answer:
15
Step-by-step explanation:
Let write the factors of each number:
45: (1,3,5,9,15,45)
60:(1,2,3,4,5,6,10,12,15,20,30,60)
75:(1,3,5,15,15,75).
The greatest common factor is 15. So the answer is 15.
15 is the greatest number that divides 45 60 75 without leaving remainder
5(a+x)
3(2x-5y)
13b(a-2)
Common in 5a + 5x is 5 so take it out.
Common in 6x -15y is 3 so take it out.
Common in 13ab-26b is 13b so take it out
The answer is 59cm squared.