Solve the system of equations by the addition method.
A. (-1, -5)
B. (-2, -4)
C. (2, -5)
D. no solution
Answer: B
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Provide an appropriate answer.Find 
when r = -2 and s = 5 if w(x, y, z) = xz + y^2, x = 5r + 8, y = r + s, and z = r - s.
A. 
= -35
B. 
= -31
C. 
= 5
D. 
= -23
Solve the equation.c - 
= 0
A. - 
B. 
C. - 
D. 
Express the distance between the given numbers using absolute value. Then find the distance by evaluating the absolute value expression.39.4 and 20.4
A. |20.4 - 39.4| = -19.0 B. |20.4 + 39.4| = 59.8 C. -|39.4 + 20.4| = -59.8 D. |39.4 - 20.4| = 19.0
Solve the problem.For a hyperbolic mirror the two foci are 38 cm apart. The distance of the vertex from one focus is 9 cm and from the other focus is 29 cm. Position a coordinate system with the origin at the center of the hyperbola and with the foci on the y-axis. Find the equation of the hyperbola.
A. 
- 
= 1
B. 
- 
= 5
C. 
- 
= 5
D. 
- 
= 1