Suppose a plane is flying in the direction 32° (relative to the west). Its speed with respect to the air is 400 kilometers per hour. The wind at the plane's altitude is from the southwest at 40 kilometers per hour (see figure). What is its speed with respect to the ground? Round your answer to one decimal place.
?
?
, 
?
A. 786.9 km/hr
B. 392.9 km/hr
C. 391.1 km/hr
D. 623.0 km/hr
E. 402.94 km/hr
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 satisfying x2 + y2 ? 1; range: real numbers 0 ? z ? 1; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 1
B. Domain: all points in the xy-plane; range: real numbers 0 ? z ? 1; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 1
C. Domain: all points in the xy-plane satisfying x2 + y2 = 1; range: real numbers 0 ? z ? 1; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 1
D. Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at 
Determine the specific solutions (if any) to the equation on the interval [0, 2?).sin2 ? + sin ? = 0
A. 0, ?, 
, 
B. 0, ?, 
, 
C. 0, ?, 
D. 0, ?, 
, 
Identify the graph of the equation.
Provide an appropriate response.Why is the answer (x2 - 25)(x2 + 25) not the correct answer to the instruction "Factor 
) completely"?
What will be an ideal response?