As for v and h, v is the variable on the vertical axis, meaning velocity; what they graphed at v = M(t) and v + C(t). The equations you write will probably not mention v. On the other hand, h is just the unit, "hours". The variable is called t.I’m confused how to start step a, all I know is that they intercept each other. Does the formulas involve the v and h? And step b there isn’t a f(t) labeled on the graph so I’m confused where to start on that.
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The average rate of change for a line is indeed the slope you use in your equation; but they are explicitly asking you to calculate the average rate of change from its definition, and confirm that. So just find the values of M(0) and M(0.5) and use them in the formula. (The formula you need is not really the one you show, though it can be adapted. You should have a formula for the rate of change over an interval from a to b.)Also step C wants the average rate of change of M on interval [0,0.5]. I know the formula for average rate of change is f(x+h)-f(x)/h. Do I use the formula for m from part a and use the numbers from interval?