For one year of internet service, the total cost is $400 which includes a one time set-up fee of $40. What is the monthly fee?

The monthly fee is $30. (400-40 = 360 ; 360/12= 30)

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step-by-step explanation:

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this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x