You are purchasing books summer reading for $4.50 each. Part A: Your total cost, C, depends on, The input is, and the output is, Part B: If you purchase 12 books, write the total cost in function notation.

Part A) see the explanation

Part B)

Step-by-step explanation:

Part A)

we know that

A relationship between two variables, x, and C, represent a proportional variation if it can be expressed in the form or

Let

C ---> is the total cost (represent the output or dependent variable)

x ----> is the number of books (represent the input or independent variable)

In this problem

we have a proportional relationship between the variables x and C

Part B)  we know that

The linear equation is given by

The constant of proportionality k is the same that the slope or unit rate of the linear equation

In this problem the constant k is given

so

For x=12 books

substitute in the equation and solve for C

In function notation

i can you with this sweetie!

step-by-step explanation: