Solve the problem.A furniture manufacturer uses two types of fabric for a certain type of sofa. It is estimated that between 30 and 40 rolls of fabric A will be needed, and that the total number of rolls needed will be less than 50. Graph the possible number of rolls of fabric that are needed. 
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Express the number in decimal notation.8.1 × 105
A. 81,000 B. 8,100,000 C. 405 D. 810,000
Mathematics
Provide an appropriate response.Find the standard deviation for the scores:21322825233026282728
A. 3.06 B. 26.8 C. 3.22 D. 10.4
Mathematics
Determine where the graph of the function 
is concave upward and where it is concave downward. Also, find all inflection points of the function.
Mathematics
Find all solutions.x3 + 5x2 + 6x = 0
A. {0, 3, 2} B. {3, 2} C. {-3, -2} D. {0, -3, -2}
Mathematics