32. Answer: 2+5×3=17
33. Answer: 2×5+3=17
34. Answer: 2×5×3=30
35. Answer: 2×5-3=7
If 3.14 is rational, why should pi also be rational ?
The answer to your question is: Because pi is not 3.14 .
At least about 20 points it can depend on the class but not really.