#13 would be 100%.
#15 would be $9.90.
#17 would be 408.
#19 would be 27840.
#21 would be 26.
Sorry for the late reply.
Answer:
$31.95 Before tip.
Step-by-step explanation:
I believe you should just add 17.75+80%=31.95
Answer:
I think this is the correct solution
A polynomial with 9 turning points has a power of 10. It must have one more power than the number of turning points.