Find the largest open intervals where the function is concave upward.f(x) = 
A. (0, ?)
B. (0, ?), (-?, 0)
C. (-?, ?)
D. (-?, 0)
Answer: A
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Given a group of students: 
or 
list and count the different ways of choosing the following officers or representatives for student congress. Assume that no one can hold more than one office.Four representatives
A. ABCD, ABCE, ACDE, ADEB, BCDE; 5 B. ABCD, ABCE, ACDE, ADEB, BCDE, BCEA, BDEA, CABD, CEDB, DACE; 10 C. ABCD, ABCE, ACDE, ADEB; 4 D. ABCD; 1
Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.x = 6e- y2, y = 0, x = 0, y = 1
A. 12
?
B. 6
?
C. 6(e - 1) ?
D. 12
?
Solve the problem.Behemoth Back Packs, Inc. finds that the cost to make each of its backpacks is $25 and each backpack sells for $40. If the company's fixed costs for a month are $7,318, how many backpacks must the company sell in a month in order to make a profit?
A. at least 488 backpacks B. at least 146 backpacks C. at most 75 backpacks D. at least 113 backpacks
Write the fraction in decimal notation.6
A. 8.57142857 B. 6.7 C. 4.2 D. 5.3