Answer:
f^-1 (x) = -21x + 7 is your answer
Yes because fraction wise the denominator that is the smallest is greater. At least that is what I learned
The arithmetic sequence is x - 85 for each one.
170 - 85 = 85
85 - 85 = 0
0 - 85 = -85
and so on
so you subtract 85 each time
hope this helps
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