A bird sanctuary initially contains 1000 birds. Each year, 10% of the birds fly away, so the sanctuary is restocked with 40 new birds. Write a recursive rule for the number an of birds at the start of the nth year.
I need An = ?

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step-by-step explanation:

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step-by-step explanation:

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step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.