Simplify.
A. -4
B. 4
C. -16
D. 16
Answer: A
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Solve the problem.A tank initially contains 140 gal of brine in which 60 lb of salt are dissolved. A brine containing 5 lb/gal of salt runs into the tank at the rate of 7 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 5 gal/min. Write, in standard form, the differential equation that models the mixing process.
A. 
+ 
y = 35
B. 
+ 
y = 25
C. 
+ 
y = 35
D. 
= 35 - 
y
Solve the problem.Use a Taylor series to estimate the integral's value to within an error of magnitude less than 10-3.
A. 0.5911 B. 0.2899 C. 0.5352 D. 1.401
Find the solution to the system of equations by substitution.
A. (3, 5) B. (-2, 5) C. (-3, 6) D. (6, -3)
Factor completely.2a3 + 2a2 - 24a
A. 2a(a - 4)(a - 3) B. 2a(a + 4)(a + 3) C. 2a(a - 4)(a + 3) D. 2a(a + 4)(a - 3)