Answer:
y = square root(x/7)
Step-by-step explanation:
switch x and y
x = 7y^2
solve for y
x/7 = y^2
square root(x/7) =y
y inverse is
y= square root(x/7)
Polynomial :



The rest are not polynomials.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
I hope that helps you out!!
Any more questions, please feel free to ask me and I will gladly help you out !
~Zoey
I know i have terrible handwriting so... let me know if you need me yo explain