What's the best way for you to study something that isn't vocabulary?

How do you work out 21.3-8= show your working. plz

Of the population of the united states is obese. a. 10% b. 25% c. 33% d. 50% select the best answer from the choices provided. a b c d

What is an example of a college admissions test? -state test -cat -act -personality test