Casey bought a football jersey that cost $129.50. With tax, he paid $137.50. What is the sales tax rate?
1 answer:
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Answer:
Step-by-step explanation:
To find the inverse of a function replace f(x) with x and the original x with y
Now we can solve for y
Square both sides so we can cancel out the root
Now subtract 7 from both sides
Now replace y with the inverse of f(x),