Solve the equation. If the equation is an identity or a contradiction, state this.13x + 5(x + 1) = 18(x + 1) - 13
A. {0}
B. ? or { }; contradiction
C. {1}
D. all real numbers; identity
Answer: D
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Multiply.
A. 
B. - 
C. 
D. - 
Postal regulations specify that the combined length and girth of a parcel sent by parcel post may not exceed 120 in. Find the dimensions of the rectangular package that would have the greatest possible volume under these regulations. (Hint: Let the dimensions of the box be x'' by y'' by z'' (see the figure below). Then, 
, and the volume
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. Maximize 
.)
?
?
A. x = 20 inches, y = 40 inches, z = 20 inches, V = 16,000 cubic inches
B. x = 20 inches, y = 20 inches, z = 17 inches, V = 6,800 cubic inches
C. x = 22 inches, y = 40 inches, z = 22 inches, V = 16,000 cubic inches
D. x = 22 inches, y = 39 inches, z = 17 inches, V = 14,586 cubic inches
E. x = 22 inches, y = 40 inches, z = 17 inches, V = 14,586 cubic inches
Find an equation of an ellipse satisfying the given conditions.Foci at (-5, 0) and (5, 0); length of major axis: 12
A. 
+ 
B. 
+ 
C. 
+ 
D. 
+ 
Solve. Then graph. Write the solution set using interval notation.3x - 2 > 25
A. x < -9
B. x > 9
C. x > 
D. x > 27