Final answer:
When comparing ratios and rates, find equivalent ratios and rates with a common unit. To make predictions, use a scale factor by multiplying it with the desired quantity.
Step-by-step explanation:
When comparing ratios and rates, it is important to find equivalent ratios and rates with a common unit. This allows for a meaningful comparison between the two quantities.
To make predictions, we can find a scale factor by comparing two known ratios or rates. We can then multiply this scale factor by the desired quantity to make an estimate or prediction.
For example, if we know that the ratio of boys to girls in a class is 2:3, and we want to predict the number of boys in a class with 30 students, we can find the scale factor (2/3) and multiply it by the number of students. This gives us (2/3) * 30 = 20 boys.