The fee Jack Duffy charges per mile is $0.278, making option B correct.
Detailed explanation:
Given:
Jack Duffy's travel distance = d = 12,568 miles
Fixed costs amount to = $1,485.00
Variable costs amount to = $2,015.75
Let the cost per mile charged by Jack Duffy be = $x
According to the provided information
Total cost = Fixed costs + Variable costs
Thus, Total cost = $1,485.00 + $2,015.75
This equates to Total cost = $3,500.75
Therefore,
The cost Jack Duffy charges per mile = 
Hence, x = $0.278 per mile
This leads us to conclude that Jack Duffy’s charging rate is $0.278 per mile, confirming option B.
I believe there are 1,600 students enrolled in metaphysics.
The correct response is:
3 inches rise for every foot in length
Explanation:
To derive the rate of change, we need to compute the difference in height and the difference in distance. The rate of change is expressed as rise/run, or
(change in height)/(change in length).
The respective heights at the specified points are 18 inches and 12 inches, resulting in a change of 18-12 = 6 inches.
The corresponding lengths at those points are 6 feet and 4 feet, yielding a change of 6-4 = 2 feet.
This implies our rate of change is (6 inches)/(2 feet), which simplifies to (3 inches)/(1 foot), indicating a rise of 3 inches for each foot of incline on the driveway.
