Perform the indicated operations and simplify. Assume all variables represent positive real numbers.
+ 2
+ 5
A. 7
B. 53
C. 53
D. 7
Answer: C
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Solve the problem.A tank initially contains 100 gal of brine in which 40 lb of salt are dissolved. A brine containing 
of salt runs into the tank at the rate of 4 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 3 gal/min. Find the solution to the differential equation that models the mixing process.
A. y = 4(50 + t) - 
B. y = 4(50 + t) - 
C. y = 2(100 + t) - 
D. y = 2(100 + t) - 
Decide whether or not the set is closed under multiplication.{1, 2, 3, 4, . . .}
A. Closed B. Not closed
Write the form of the partial fraction decomposition of the rational expression. Do not solve for the constants.
A. ?
B. ?
C. ?
D. ?
E. ?
Classify the graph of the equation below as a circle, a parabola, an ellipse, or a hyperbola.
A) hyperbola
B) ellipse
C) circle
D) parabola