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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Simplify the complex fraction.
A. 
B. - 
C. 46
D. 
Mathematics
Determine whether the triangles in the given pair are congruent. If so, state the property that shows the triangles are congruent.
A. congruent; ASA B. congruent; SAS C. not congruent D. congruent; AAS
Mathematics
Factor the polynomial completely.x2 - 40x + 400
A. (x + 20)2 B. (x - 20)2 C. (x + 20)(x - 20) D. Prime
Mathematics
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?
A. 4.03 mi B. 0.78 mi C. 1.03 mi D. 3.05 mi
Mathematics