Solve the problem.A model for advertising response is given by   where N(a) = the number of units sold and a = the amount spent on advertising, in thousands of dollars. How many units are sold after spending $3000 (a = 3) on advertising?

A. 2203
B. 7905
C. 2378
D. 1881


Answer: C

Mathematics

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A.
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A. congruent; ASA B. congruent; SAS C. not congruent D. congruent; AAS

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Factor the polynomial completely.x2 - 40x + 400

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Solve the problem.An airplane is sighted at the same time by two ground observers who are 3 miles apart and both directly west of the airplane. They report the angles of elevation as 15° and  How high is the airplane?

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Mathematics