Maria created a graph of B(t), the temperature over time. For the interval between t = 3 and t = 7, the average rate of change in her graph of B(t) is 8. Which statement must be true?
If y varies directly as x, and y is 6 when x is 72, what is the value of y when x is 8?


What is the average rate of change in f(x) over the interval [4,13]?





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