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) - 
Answer: D
Mathematics
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. (2-2)0
A. 1
B. 
C. 0
D. -4
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Simplify the radical expression. Indicate if the expression is not a real number.
A. 
B. 
C. 
D. 
Mathematics
Convert to decimal notation.106
A. 100,000,000 B. 10,000,000 C. 1,000,000 D. 100,000
Mathematics
Find the derivative of the function.y = 7 sin x4
A. 
= 28x3 cos x4
B. 
= 28x4 cos x4
C. 
= 28x3 cos x3
D. 
= x cos x4
Mathematics