Question

Camile has a plan for her cell phone in which she pays a fixed rate for calls and a certain amount for each text message sent. When she sent

300
messages, her total bill was
$
21.60
and when she sent
525
messages, her total bill was
$
26.10
.

Write a function of the total cost,
f
(
x
)
based on the number of messages sent,
x
.

Answer 1

To write a function of the total cost based on the number of messages sent, we need to determine the fixed rate for calls and the cost per text message. We can use the given information to set up two equations and solve them to find the values of r and c. Then, we can write the function using these values.

Step-by-step explanation:

To write a function of the total cost based on the number of messages sent, we need to determine the fixed rate for calls and the cost per text message.

We can use the given information to set up two equations:

1.60r + 300c = 21.60

1.60r + 525c = 26.10

Where r is the fixed rate for calls and c is the cost per text message.

To solve these equations, we can use elimination or substitution method.

Once we find the values of r and c, we can write the function f(x) = r + cx, where x is the number of messages sent.