For meg's long-distance calling plan, mostly cost c in dollars is given by the linear function c (t)= 6 + 0.05t, where t is the number of minutes talked. a) what is the total cost of talking 8 hours? of talking 20 hours? b) what is the effective cost per minute (the total cost divided by the number of minutes talked) of talking 8 hours? of talking 20 hours?

It cost $30 to talk for 8 hours and $66 to talk for 20 hours.      

Step-by-step explanation:

We are given the following information in the question:

Cost C in dollars is given by a linear function:

, where t is the number of minutes talked.

a) Total cost f talking for 8 hours

1 hour = 60 minutes

8 hours = 480 minutes

20 hours = 1200 minutes

Putting t = 480 in the given cost function,

Putting t = 1200 in the given cost function,

Thus, it cost $30 to talk for 8 hours and $66 to talk for 20 hours.

b)

answer: the common difference is -0.10

25% is the answer