List the proper fractions in the group.
, 
, 
, 
, 
A. 
, 
, 
B. 
, 
, 
C. 
, 
D. 
, 
, 
Answer: C
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Sketch the surface z = f(x,y).f(x, y) = -x2 - y2
A. 
B. 
C. 
D. 
Solve.A weight hanging from a spring is stretched and released. The following graph shows the displacement of the weight from its natural position, where t is time in seconds and D is the displacement in inches.
Estimate all solutions to the equation D = 4 on the interval [0, 2].
A. t = 0, 0.5, 1, 1.5, 2 B. t = 0, 1, 2 C. t = 0.75, 1.5, 1.75 D. t = 0.25, 0.75, 1.25, 1.75
Solve the problem.Subtract (2xy2 + 4xy) from the difference between 
and 
A. -2x2y + 6xy2 - 7xy B. -2x2y - 6xy2 - 7xy C. -2x2y + 6xy2 + 1xy D. -4x2y - 4xy2 - 7xy
Solve the problem.An object is propelled vertically upward from the top of a 304-foot building. The quadratic function 
models the ball's height above the ground, 
in feet, t seconds after it was thrown. How many seconds does it take until the object finally hits the ground? Round to the nearest tenth of a second if necessary.
A. 10.8 seconds B. 2 seconds C. 1.8 seconds D. 4.5 seconds