Seven friends have similar cell phone plans. the price of each plan is $x. three of the seven friends pay an extra $4 per month for unlimited text messaging. write and simplify an expression that represents the total cost of the seven plans

$ (7x+12)

Step-by-step explanation:

We have that,

Price of each cell phone plan = $x

Since, 3 friends pay extra  $4 for the plan.

Thus, the amount paid by the three friends is $ 3(x+4).

Now, as the ramaining people do not pay the extra cost and there are 7-3 = 4 people remaining.

Thus, the amount paid by remaining people = $ 4x

Thus, the total cost of the plan will be $ [3(x+4) + 4x] = $ (7x+12).

Hence, the expression for the total cost of the seven plans is $ (7x+12).

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