A tank initially contains 150 lbs of salt dissolved in 600 gal of water. Saltwater containing 2 lbs of salt per gal enters the tank at the rate of 5 gal per min. The mixture (kept uniform by stirring) is removed at the same rate. How many pounds of salt are in the tank after an hour?
What will be an ideal response?
84.14 lb
Mathematics
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Evaluate the integral.
A. 
B. 58
C. 
D. 
Mathematics
Evaluate the integral.
A. 
sin 5x + 
sin 9x+ C
B. - 
cos 9x - 
cos 5x + C
C. - 
cos 9x - 
sin 9 x + C
D. 
sin 5x - 
sin 9x+ C
Mathematics
Solve the system. Express the solution in the form (x, y, z, w).4x + y - 4z + w = 1-x + 4y + z - 4w = -144x - y + 4z + 4w = 29 x + y - 4z - w = -10
A. {(5, -5, 3, -2)} B. {(-5, -3, 6, 2)} C. {(5, -10, 0, 2)} D. {(-5, 4, 4, 1)}
Mathematics
Evaluate the series, if it converges.
A. Does not converge.
B. 
C. 
D. - 
Mathematics