Question 1165860
The formula for converting a temperature in degrees Fahrenheit into degrees Celsius is c=5/9(f-32) .
a) Write the formula in function notation.
c = f(f)
f(f) = {{{5/9}}}(f-32)
:
b) Determine f-1. What does the inverse represent?
c = {{{5/9}}}(f-32)
swap c and f and solve for c
 f = {{{5/9}}}(c-32)
multiply both sides by 9
9f = 5(c-32)
9f = 5c - 160
add 160 to both sides
9f + 160 = 5c 
or
5c = 9f + 160
divide both sides by 5
f = {{{9/5}}}c + {{{160/5}}}
f = {{{9/5}}}c + 32
It represents finding f from a given temp in c
:
c) Use the inverse function to convert 9 °C into degrees Fahrenheit.
steps needed also
f = {{{9/5}}}(9) + 32
f = {{{81/5}}} + 32
f = 16.2 + 32
f = 48.2 degrees