Does the system have one solution, no solution, or an infinite number of solutions?5x - 25y = 20y = 
x - 
A. One
B. Infinite number
C. No Solution
Answer: B
Mathematics
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Find the derivative.y = 9 sin 5x cos x
A. 9 sin 5x sin x + 45 cos x cos 5x B. sin 5x sin x + 45 cos x cos 5x C. -9 sin 5x sin x + 45 cos x cos 5x D. -9 sin 5x sin x + cos x cos 5x
Mathematics
Solve the problem.A 200 gal tank is half full of distilled water. At time = 0, a solution containing 1 lb/gal of concentrate enters the tank at the rate of 4 gal/min, and the well-stirred mixture is withdrawn at the rate of 
When the tank is full, how many pounds of concentrate will it contain?
A. 100 pounds B. 200 pounds C. 120 pounds D. 150 pounds
Mathematics
Solve and check.
= 
A. x = 
B. x = 
C. x = 
D. x = 
Mathematics
Solve the inequality and graph the solution.
< 4
A. 
B. 
C. 
D. 
Mathematics