Which of the following functions represents a cell phone bill if there is a monthly charge of 20 dollars plus 6 cents for each minute of use?

f(x) = 20 + 6x
f(x) = 20.06x
f(x) = 20 + 0.06x

Question

Which of the following functions represents a cell phone bill if there is a monthly charge of 20 dollars plus 6 cents for each minute of use?

f(x) = 20 + 6x
f(x) = 20.06x
f(x) = 20 + 0.06x

anonymous · Answer

x= for how many minutes did you use 
so 20+ the extra charges
so 20 + 6(minutes)
20+6x

anonymous · Answer

wait
it said cents right :/

anonymous · Answer

how many cents = 1 dollar

anonymous · Answer

okay 100 cent
6 cent becomes 0.06 dollar
so its 20 + 0.06x