What is the greatest common factor of 18, 36, and 90?

18

Step-by-step explanation:

18 will divide into both 36 and 90 , but 45 will not, so 18 is the GCF.

18

Step-by-step explanation:

the greatest common factor is the greatest number that all of those number could be divided by and have an outcome of a whole number

18 is the greatest common factor because

18/18=1

36/18=2

90/18=5

have a great day :D

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

idk wbu

step-by-step explanation: