If the cost of maintenance is expressed in an equation, what is the independent variable for this data?

Maintenance cost at a hospital was observed to increase as activity level increased.

The following data was gathered:

Activity Level –

Maintenance Cost

Month

Patient Days

Incurred

January

5,600

$7,900

February

7,100

$8,500

March

5,000

$7,400

April

6,500

$8,200

May

7,300

$9,100

June

8,000

$9,800

If the cost of maintenance is expressed in an equation, what is the independent variable for this data?
A . Fixed cost.
B . Variable cost.
C . Total maintenance cost.
D . Patient days.

Answer: D

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