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

Option 3rd is correct

Step-by-step explanation:

Let x be the time in minutes and f(x) be the cell phone monthly bill.

Given the statement:

if there is a monthly charge of 20 dollars plus 6 cents for each minute of use

Use conversion:

1 cent = 0.01 dollars

6 cents = 0.06 dollars

" means 0.06 x

then;

the function represents a cell phone monthly bill is given as:

none.

step-by-step explanation:

m

1

=

5

m1=5

b

=

−

1

b=-1

find the slope and y-intercept of the second equation.

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m

2

=

0

m2=0

b

=

−

6

b=-6

compare the slopes

m

m of the two equations.

m

1

=

5

,

m

2

=

0

m1=5,m2=0

compare the two slopes in the decimal form. if the slopes are equal, then the lines are parallel. if the slopes are not equal, then the lines are not parallel.

m

1

=

5

,

m

2

=

0

m1=5,m2=0

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