Solve the equation.0.4x - 0.7x - 9 = 15
A. 80
B. -80
C. -74
D. 74
Answer: B
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Solve the problem.A cable company charges by the number of movie channels a subscriber chooses. The cost is given by 
where x is the number of movie channels. What is the cost for 2 movie channels.
A. $88.06 B. $27.50 C. $31.20 D. $19.30
Solve.The amount of time it takes a swimmer to swim a race is inversely proportional to the average speed of the swimmer. A swimmer finishes a race in 75 seconds with an average speed of 4 feet per second. Find the average speed of the swimmer if it takes him 100 seconds to finish the race.
A. 2 feet per second B. 5 feet per second C. 4 feet per second D. 3 feet per second
Identify the figure as a line, line segment, or ray and name it using the appropriate symbol.
A. Ray named 
B. Line named 
C. Ray named 
or 
D. Line named 
or 
Find the standard equation of the parabola that satisfies the given conditions. Vertex: (4, -5); directrix: x = 11
A. (y + 5)2 = -28(x - 4) B. (y - 4)2 = -28(x + 5) C. x2 = -28(y - 4) D. (x + 5)2 = -28(y - 4)