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 = 2(100 + t) - 
B. y = 2(100 + t) - 
C. y = 4(50 + t) - 
D. y = 4(50 + t) - 
Answer: A
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Use the preference table to answer the question.Diners at the Rive Gauche restaurant answer a questionnaire about their favorite course in a French meal. The choices are: Appetizer (A), Entree (E), and Dessert (D). Their votes are summarized in the following table.
Which course is selected as the most favorite using the pairwise comparison method?
A. Tie between Appetier and Dessert B. Tie between Entree and Dessert C. Tie between Appetizer and Entree D. Appetizer, Entree, and Dessert in a three-way tie
Simplify the expression. Assume that all variables are positive when they appear.
A. 
B. 9x
C. x 
D. 
Write the expression in standard form.(7 - 5i)(5 - 6i)
A. 5 + 67i B. 5 - 67i C. 65 + 35i D. 30i2 - 67i + 35
A card is drawn randomly from a standard 52-card deck. Find the probability of the specified event. The card is the jack or queen of hearts.
A. 
B. 
C. 
D. 