Plot the given point in a rectangular coordinate system.
A. 
B. 
C. 
D. 
Answer: A
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Find the direction angles of each vector. Round to the nearest degree, if necessary.v = -12i - 4j + 6k
A. ? = 94°, ? = 91°, ? = 88° B. ? = 149°, ? = 107°, ? = 65° C. ? = 161°, ? = 108°, ? = 62° D. ? = 157°, ? = 108°, ? = 63°
Solve the problem.Write parametric equations for the tangent line to the curve of intersection of the surfaces 
and 
at the point 
A. 
B. 
C. 
D. 
Find a rectangular equation for the curve and describe the curve.x = 
, y = 
t; -2 ? t ? 2
A. x = 
; portion of an ellipse
B. x = 
; portion of an ellipse
C. x = 
; portion of an ellipse
D. x = 
; portion of a circle with radius 2
Use a proportion to solve the problem.The ratio of the lengths of strings that play the notes D and A is 3 to 2. If a string 54 centimeters long plays a D, what is the length of the string that plays an A?
A. 57 centimeters B. 36 centimeters C. 56 centimeters D. 81 centimeters