1. Write a cost function for each situation. Identify all variables used. (a) A chain-saw rental firm charges $12 plus $1 per hour.
(b) A trailer-hauling service charges $445 plus $2 per mile.
(c) A parking garage charges 50¢ plus 35¢ per half-hour.
(d) For a one-day rental, a car rental charges $44 plus 28¢ per mile.

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

step-by-step explanation: