y Notes Ask Your T 10. -44 polnts SAlg Trig4 0.1.505.XP M A phone card company c

Question

y Notes Ask Your T 10. -44 polnts SAlg Trig4 0.1.505.XP M A phone card company charges a 25¢ connection fee for each call and 5¢ per minute. (a) How much does a 12-minute call cost? (b) Find a formula that models the cost C (in dollars) of a phone call that lasts t minutes. (c) If a particular call costs $1.70, how many minutes did the call last? min (d) Find a formula that models the cost C (in cents) of a phone call that lasts t minutes if the connection fee is F cents and the rate is r cents per minute. C- Read It Submit Assignment Save Assignment Progress

Explanation / Answer

the function for the charges become

y = .05x + .25

where x is the number of minutes

a) for 12- minute call plug x = 12

y = .05(12) + .25

y = 0.85

it costs $ 0.85 for 12-minute call

b) formula is C = .05t + .25

c) plugging C = 1.70

1.70 = 0.05t +0.25

1.70 - 0.25 = 0.05t

t = 29 minutes

d) formula for cost in cents

C(cents ) = rt + F

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