Jake's water bill is $24.60 per month plus $2.00 per ccf (hundred cubic feet) of water. What is the maximum number of ccf Jake can use if he wants his bill to be no more than $64.00?

Jake can use 19.70 ccf to not exceed $ 64.00 in water bill.

Step-by-step explanation:

The cost function of water bill is:

Where:

- Fix costs, measured in USD.

- Variable costs, measured in USD.

The fix and variable costs are, respectively:

Where is the water capacity consumed within a month, measured in cubic feet. Therefore, first formula is expanded:

If , the maximum water capacity is:

Which is equivalent to 19.70 ccf.

range is infinite on both x and y axis positive and negative

step-by-step explanation: