Is 600: 450 and 60: 45 equivalent ratios?

Yes.

Step-by-step explanation:

600: 450 and 60: 45 are equivalent ratios.

For this problem, you don't even have to write down anything because it can simply be done in your head. As you can see, 60 is just 600 without the extra zero and 45 is also 450 without the extra zero. Therefore, you have to multiply 60 and 45 by to get the equivalent ratio, 600:450.