Question

hey can you please help me posted picture of question

Answer 1

We have the following function:
 C (n) = 20n + 15
 Clearing t we have:
 20n = c - 15
 n = c / 20 - 15/20
 Rewriting:
 N (c) = (c-15) / 20
 Answer:
 The inverse function for this case is given by:
 N (c) = (c-15) / 20
 option B