Add or subtract and write answer in lowest terms.
+ 
A. 
B. 
C. 
D. 
Answer: B
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: parabolas 
B. Domain: all points in the xy-plane excluding x = 0; range: all real numbers; level curves: parabolas 
C. Domain: all points in the xy-plane excluding x = 0; range: real numbers z ? 0; level curves: parabolas 
D. Domain: all points in the xy-plane; range: all real numbers; level curves: parabolas 
Write an algebraic equation and use it to solve the problem.The length of a rectangular room is 8 feet longer than twice the width. If the room's perimeter is 196 feet, what are the room's dimensions?
A. Width = 35 ft; length = 78 ft B. Width = 60 ft; length = 136 ft C. Width = 45 ft; length = 53 ft D. Width = 30 ft; length = 68 ft
Solve the equation.-2b = 30
A. {-32} B. {1} C. {32} D. {-15}
Solve the problem.A standardized math test was given to 6000 students. The scores were normally distributed with a mean of 380 and a standard deviation of 50. How many students scored between 380 and 480?
A. 2040 B. 5700 C. 2850 D. 4080