Answer: 2a

Step-by-step explanation:

18a: 1,2,3,6,9,18 then there's A

20ab: 1,2,4,5,10,20 then there's A and B

6ab: 1,2,3,6 then there's A and B

All have a 2 and an A in common so it's 2a

Answer: The value of y=9.

**Answer:**

A&C are similar; others are not similar

**Step-by-step explanation:**

An easy way to check for similarity among rectangles is to look at their aspect ratio. The ratio of long side to short side for each rectangle is ...

A: 100/80 = **5/4**

B: 120/100 = 6/5

C: 90/72 = **5/4**

**Rectangles A and C are similar**. No other pair is.

The answer would be C have a good day