Estimate  the difference. use benchmarks with decimal parts of 0, 0.25, 0.50, or  0.75
7.23-1.43
a. 5.50
b. 5.75
c. 6

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.