Perform the indicated operation(s). Simplify if possible.
+ 
- 
A. 
B. 
C. 
D. 
Answer: B
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Provide an appropriate response.Find the coordinates of all points (x, y) on the graph of the equation x2 - xy + y2 = 12 where the tangent is parallel to the 
A. (-4, -2), (-2, 2), (2, -2), (4, 2) B. (-2, -4), (2, 4) C. (-2, -4), (-2, 2), (2, -2), (2, 4) D. (4, -2), (4, 2)
Use Cramer's rule to solve the system. x + y + z - w = 6 2x - y + 3z + 4w = -4 4x + 2y - z - w = -13 -x - 2y + 4z + 3w = 12
A. 
B. 
C. 
D. Can't use Cramer's rule, D = 0
Solve.Two plumbers make house calls. One charges $90 for a visit plus $40 per hour of work. The other charges $70 per visit plus $50 per hour of work. For how many hours of work do the two plumbers charge the same?
A. 2 hr B. 2.5 hr C. 1.5 hr D. 1 hr
Use a calculator to find the approximate value of the expression. Round the answer to two decimal places.cos 64°
A. 0.44 B. 0.39 C. 0.57 D. 0.26