Perform the indicated operations, expressing the answer in simplest form with rationalized denominators.
A. 
B. 
C. 
D. 
Answer: B
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Find the equation for the level surface of the function through the given point.f(x, y, z) = 
, (7, 2, 4)
A. The level surfaces cannot be determined.
B. 
= 
C. 
= 
D. 
= 
Graph using the slope and y-intercept.3x + y = -4
A. 
B. 
C. 
D. 
Solve the problem. Round your answer to the nearest tenth.A person is pulling a freight cart with a force of 49 pounds. How much work is done in moving the cart 30 feet if the cart's handle makes an angle of 34° with the ground?
A. 1218.7 ft-lb B. 82.2 ft-lb C. 822.0 ft-lb D. 1285.7 ft-lb
Graph the function by hand. Use the graph to (a) find the range, (b) give the interval over which the function is increasing, and (c) give the interval over which the function is decreasing. Round approximations to two decimal places.f(x) = 
A. (a) [0, ?) (b) (-?, -1.40) (c) (1.40, ?) B. (a) [0, ?) (b) (1.40, ?) (c) (-?, -1.40) C. (a) [-49, ?) (b) (0, ?) (c) (-?, 0) D. (a) [0, ?) (b) (1.40, ?) (c) (-?, 1.40)