Based on the graph shown to the right, whose phone cost varies directly with the amount of time spent talking? Mark’s only✔ Nikiya’s onlyboth Mark’s and Nikiya’s
Mark’s cost does not vary directly with time spent talking because the cost for t = 0 is undefined✔ the cost of 0 hours is not 0 dollarsthe C-intercept is 0
Base on these results, the runner ran at a rate between 0.5 and 2 hours than between 1.5 and 2.5 hours.
The ratios
Which graph shows a function that always has a negative average rate of change?
which represents Nikiya’s total cost✔ cost per hourtime spent talking
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