Suppose that the water level of a river is 6 feet and is increasing at a rate of 0.25 foot per day. Write the variable expression to represent the depth of the river in terms of d, the number of days.

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Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is