The cost of a phone call at a hotel is determined by the formula
C = 0.35t + 0.6
Where C is the cost in dollars and T is the length of the call, in minutes.
What is the length of a call that costs 5.85
(a) 3 minutes
(b) 6 minutes
(c) 15 minutes
(d) 18 minutes
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Respuesta :

C = $5.85

$5.85 = 0.35t + 0.6
-.6 -.6

$5.25 = 0.35t
------- --------
.35 .35

15 = t

15 minutes