If 3 pieces of candy cost $2.10, how much would four pieces cost?

First of all, all you have to do is compare the two statements
3 pieces=$2.10
4 pieces= Y
Y is the unknown value
Next, cross and multiply. That will be;
4 x 2.10=3 x Y
8.4=3Y
Divide both sides by 3
Y=8.4/3
Y=2.8
It will cost $2.80 or $2.8
Hope that helped. Have a nice day

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.