Perform the indicated operation and simplify.
+ 
+ 4
A. 
B. 
C. 
D. 
Answer: B
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Divide.
A. 0.0051 B. 0.49 C. 0.051 D. 0.049
Write the decimal as a proper fraction or mixed number in lowest terms.1.09
A. 1
B. 
C. 1
D. 
Translate the problem to a system of equations, then solve using Cramer's Rule.Jerry has 3 pieces of string. The total length is 82 inches. The sum of the two longer pieces is 70. The middle piece is twice as long as the shortest piece. What are the lengths of the 3 pieces?
A. 6, 12, and 64 inches B. 12, 24, and 46 inches C. 12, 46, and 56 inches D. No solution
Find the open intervals where the function is concave upward or concave downward. Find any inflection points.
A. Concave upward on (-?, -2); concave downward on (-2, ?); no inflection points B. Concave upward on (-2, ?); concave downward on (?, -2); inflection point at (-2, 2) C. Concave upward on (-?, -2); concave downward on (-2, ?); inflection point at (-2, 2) D. Concave upward on (-2, ?); concave downward on (-?, -2); no inflection points