Answer: x=9 is an extraneous solution
Step-by-step explanation:
Given
Function is 
for function to exist

Therefore, 9 satisfies the above equation. It is it's extraneous solution.
APR is different than other compounding periods because you would need to find some equivelancy to compare things at.
Answer:13.2277
Step-by-step explanation:
Did it on iready
Answer:
18/5 or 3.6
Step-by-step explanation:
3.6=36/10=18/5