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Denise buys flour in bulk for her bakery. The cost per pound of flour is graphed below. Which BEST describes the function of the cost of flour ever the interval [0,15]?

A, a piece-wise function with separate pieces of linear functions only

B, a step-function for the entire interval

C, a single linear function with a three point of discontinuity

D, a piece-wise function with separate pieces of linear and step-functions

Denise buys flour in bulk for her bakery The cost per pound of flour is graphed below Which BEST describes the function of the cost of flour ever the interval 0 class=

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MissPhiladelphia
Based from the graph, I think the answer is D. a piece-wise function with separate pieces of linear and step-functions. This is because as you can see from the graph, for intervals [0,1], [5,6], and [10,11] the function is linear. On the other hand, for the remaining intervals, it has a constant value which can be described as a step function. 
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