Brenda is buying 6 concert tickets online. Each ticket costs $15, plus a service fee of x dollars. Write the function () that shows the total amount that Brenda will pay for the tickets.

F(x) = 90 + x

Step-by-step explanation:

Giveb that :

Number of tickets = 6

Cost per ticket = $15

Service fee = $x

Total amount Brenda paid :

Cost of 6 tickets = (15 * 6) = $90 + service charge

F(x) = cost function

F(x) = 90 + x

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!