The sides in each pair of figures are proportional. Find the missing length.
A. 7 ft
B. 23 ft
C. 42 ft
D. 14 ft
Answer: D
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At what points is the given function continuous?f(x, y) = 
A. All (x, y)
B. All (x, y) satisfying x - y ? 0
C. All (x, y) such that x ? 
and x ? -2
D. All (x, y) such that x ? 0
In a series circuit consisting of several resistances, the total resistance is equal to:
a. The lowest value of resistance b. The sum of all resistances c. The highest value of resistance d. One half the value of all the resistances e. The reciprocal of all the resistances
Use Cramer's rule to solve the linear system. If D = 0, use another method to determine the solution set.x - y + z = 3x + y + z = -5x + y - z = -7
A. Cramer's rule does not apply since D = 0; ? B. {(-2, 1, -4)} C. {(-2, -4, 1)} D. {(1, -2, -4)}
Match the system of equations with one of the graphs.y2 - 14y = x - 7xy = 7
A. 
B. 
C. 
D. 