HELP ME PLEASEEEEEEEEE

3r

Step-by-step explanation:

there is an invisible 1 in front of the rs. Add them and you get 3r

3r

Step-by-step explanation:

Let's replace r with a number.

For example,

r=3

3+3+3=9

We know also that 9=3 multiplied by 3. Therefore, r+r+r=3r

It would be 2 I believe because is ten is the measurement of line AC and 20 is the measurement of line A1C1(sorry Idk how to make the numbers small) to get to 20 from 10 you would multiply 10x2 which would be letter B in your case for the answer. (Sorry if this is incorrect, I’m no expert)