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January 28, 2015

January 28, 2015

Posted by **Anonymous** on Sunday, September 19, 2010 at 8:39pm.

C(t)=

use the model to find the total cost for 3 months of service

total cost=

- math -
**Sabrina**, Sunday, September 19, 2010 at 9:32pmI'm using 'x' instead of '+' to make the answer less confusing.

The cost for the phone is $30, and that's a one time charge.

The cost for x months would be 20 times x, or 20x

So, the model for the total cost is C(x) = 30 + 20x.

x= 30 + 20(1)= 50

x= 30 + 20(3)= 90

If x = 1 month, the cost would be $50. For three months, it would be $90, and so forth.

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