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Hi my sisters and brothers can tell me the answer because i don’t understand the question

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

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 . reset next