The ratios a:b and b:c are equivalent to one another Select all the statements that must be true 1. a=c 2. [tex] \frac{b}{a} = \frac{c}{b} [/tex] 3. b-a=c-b 4. a 5. if a=b, then b=c I think #2 is correct ,but I don't know about the others

a : b
b : c

Imagine if the ratio is as follows :
3 : 6
6 : 12

Yes, only number 2 is correct.

Your number 4 seems to only consist of a. Hence, I can't make any assumptions based on that.

So yes, only number 2 is correct.

Hope this helps. - M