In order to determine how American undergraduate college students feel about eliminating spring break in order to finish spring term a week early, a survey was conducted. Two hundred undergraduate students from the University of Miami (FL) were interviewed. Both of the interviewers hired to conduct the survey were told to interview 25 freshmen, 25 sophomores, 25 juniors, and 25 seniors. Of the 200 students interviewed, 20% were in favor of the elimination of spring break, 70% were opposed, and 10% had no opinion.The sample for this survey is
A. the 180 students that had an opinion.
B. all undergraduates at the University of Miami.
C. all American undergraduate college students.
D. the 200 students that were interviewed.
E. none of these
Answer: D
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Solve the problem.The daily profit for a product is given by P = 36x - 0.02x2 - 1600, where x is the number of units produced and sold.a. Graph this function for x between 0 and 2100.b. Describe what happens to the profit of this product when the number of units produced is between 1 and 900. What happens after 900 units are produced? c. Is the graph of this function concave up or down?
A.
a.
b. The profit decreases.; The profit increases.
c. The graph is concave up.
B. a.
b. The profit decreases.; The profit increases.
c. The graph is concave down.
C. a. 
b. The profit increases.; The profit decreases.
c. The graph is concave up.
D. a.
b. The profit increases.; The profit decreases.
c. The graph is concave down.
Determine whether a linear or quadratic function would be a more appropriate model for the graphed data. If linear, tell whether the slope should be positive or negative. If quadratic, decide whether the coefficient 
of x2 should be positive or negative. DENTAL FLOSS USE 
Years since 1990
A. Linear; positive B. Quadratic; positive C. Linear; negative D. Quadratic; negative
Find an equation for the ellipse.Foci at (±2, 0); x-intercepts are ±4
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Rewrite 
as a product.
A. 
B. 
C. 
D. 
E. 