Question 18 If f(x) = 2x-6, and f ' (k) = 18, the value of k is: Not complete Marked out of 1.00 Select one: Flag question O a. 12 O b. 18 O C. 30 O d. 36 Check Question 19 The formula to convert degrees Celsius to degrees Fahrenheit is Not complete F(C) = > C+32. The graphs of F(C) and F-1 (C) intersect at the point: Marked out of 1.00 Flag question Select one: O a. (-40, -40) O b. (-40, 32) O c. (32, -40) O d. (0, 32) Check Question 20 The graph of f(x) =-(x+3) +1 is shown. The inverse function is: Not complete Marked out of 1.00 Flag question Select one: O a. x = -()'+3) +1 O b.f (x) = \\-(x-1)-3 only O c. f ( x ) = - V-(x-1) -3 O d.f (x) = N-(x-1)-3 or/ (x) = -V-(x-1) -3, but not both together