Circle all the function types that could possibly be used to model a context if the given statement applies.
a. when -values are at regular intervals, the first difference of -values is not constant.
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b. when -values are at regular intervals, the second difference of -values is not constant.
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c. when -values01 are at regular intervals, the quotient of any two consecutive -values is a constant that is not equal to or .
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d. there may be up to two different -values for = 0.
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