Consider this option (all details find in the attachment).
Answer: (-3;4)
5+(9+6^3-3)-3
Solve six cubed
5+(9+216-3)-3
Add 9 to 216
5+(225-3)-3
Subtract 3 from 225
5+222-3
Add 5 to 222
227-3
Subtract 3 from 227
Final Answer: 224
If the decimal can't be written into a ratio, then it is not rational.
To get $90 dollars you multiply $15 • 6. So you would multiply $6 • $6
Answer: $36