Answer:
The best estimate is 6
Explanation:
1. Convert 1 3/4 to a whole fraction
7/4
2. Reciprocate 7/4
4/7
3. Multiply 90/7 by 4/7
360/49
4. Simplify/Solve
7.3
5. The best estimate is 6
If I am wrong please forgive and tell me in the comment section below otherwise bu-bye.