Answer :
The answer is D. The rate of change is 3. It is a linear model.
The original equation D = 3w + 60 is in the form y = mx + b, in which m is always the rate of change. In this case, m = 3, so the rate of change is 3.
Also, when the rate of change is constant, the equation is always linear. If the equation was plotted on a coordinate plane, it would create a straight line.
The original equation D = 3w + 60 is in the form y = mx + b, in which m is always the rate of change. In this case, m = 3, so the rate of change is 3.
Also, when the rate of change is constant, the equation is always linear. If the equation was plotted on a coordinate plane, it would create a straight line.