Answer:
21/4
Explanation:
When multiplying a whole number by a fraction, the denominator of the whole number will be 1 because that way it will make it a 7 (or something like that, but the denominator of a whole number is always 1), so now we have 7/1 • 3/4 and we just multiply across. 7×3=21 and 1×4=4, so our new fraction would be 21/4, although we could make it into a mixed number, just leave it like that since your answer has to be improper.