Question

23. Write the following as an algebraic expression.

The cost of x compact discs if each compact disc costs $7.13.
The cost of x compact discs is $

Answer 1

For this case we have to:

x: It is the variable that represents the number of compact discs.

The cost function must be found considering that each disk costs $7.13. So:

`C (x) = 7.13x`

Thus, to find the total cost of "x" compact discs (in $) we substitute the number of discs in the cost function.

Answer:

`C (x) = 7.13x`