Answer:

Step-by-step explanation:
Given


Required
Determine the formula
An exponential function is of the form:

For point 




For point 

Substitute 7 for a

Divide both sides by 7

Take 4th root of both sides
![\sqrt[4]{81} =\sqrt[4]{b^4}](https://tex.z-dn.net/?f=%5Csqrt%5B4%5D%7B81%7D%20%3D%5Csqrt%5B4%5D%7Bb%5E4%7D)
![\sqrt[4]{81} =b](https://tex.z-dn.net/?f=%5Csqrt%5B4%5D%7B81%7D%20%3Db)
![b = \sqrt[4]{81}](https://tex.z-dn.net/?f=b%20%3D%20%5Csqrt%5B4%5D%7B81%7D)

Substitute 7 for a and 3 for b in 


The way this should be set up is:
9a = 3600...
So you must divide '9' on both sides, canceling out the '9', and making the 3600 to be '400'..
So the problem should look like: a = 400 <--- (Answer)
Hope it helped.. :)
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I don't know but if I were to guess I'll pick C. Hope this helps
Answer:
its 3 and 5
Step-by-step explanation:
i know this because i took the quiz and its simple