Simplify the expression. If necessary, express the result that is not a rational number as a decimal rounded to two decimal places.
A. 12
B. -12
C. -72
D. not a real number
Answer: D
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 2x2 - 2y2
A. Domain: all points in the xy-plane; range: all real numbers; level curves: hyperbolas 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: ellipses 
C. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: ellipses 
D. Domain: all points in the first quadrant of the xy-plane; range: all real numbers; level curves: hyperbolas 
Use a graphing calculator to solve the system of equations. Round your solutions to one decimal place.1.4x - 0.5y - 5.0z = 2.73.4x - 6.3y - 1.3z = -3.23.7x - 1.5y - 1.7z = 9.6
A. (14.8, 9.8, 1.0) B. (7.4, 4.9, 0.5) C. (3.7, 2.5, 0.3) D. (18.5, 12.3, 1.3)
Perform the indicated operation and write the answer in lowest terms. - 
+ 
A. - 
B. 
C. - 
D. - 
Solve the problem.Use of the internet for shopping is increasing dramatically, but still is somewhat age dependent. When a popular web site that sells books asked the age of users who bought products from them over the internet, they obtained the following data. What is the probability that a buyer on this web site is aged 
A. 3.48% B. 3.46% C. 3.36% D. 3.50%