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Which of the following is the function C(d) if C^-1 (e) = 10e + 3?

Which of the following is the function C(d) if C^-1 (e) = 10e + 3?
A.) C(d) = d/10-3
B.) C(d) = 10d - 3
C.) C(d) = d+3/10
D.) C(d) = d-3/10

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Byron S. | Math and Science Tutor with an Engineering BackgroundMath and Science Tutor with an Engineeri...
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To find the inverse of a function, substitute the function name for a variable (d is a good choice here), and solve for the original dependent variable (e in this case.)
 
So,
C-1(e) = 10 e + 3
 
Replace it with:
d = 10 e + 3
 
Now solve for e. This will give you the inverse of the function you had, and the inverse of an inverse (C-1)-1 is the original function C.