Express the rational expression in lowest terms.
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem.A tank initially contains 120 gal of brine in which 60 lb of salt are dissolved. A brine containing 3 lb/gal of salt runs into the tank at the rate of 9 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 7 gal/min. Write, in standard form, the differential equation that models the mixing process.
A. 
+ 
y = 27
B. 
= 27 - 
y
C. 
+ 
y = 21
D. 
+ 
y = 27
Add. Write your answer in lowest terms.
+ 
+ 
A. 
B. 
C. 
D. 
Graph the function.f(x) = log5(x - 2)
A. 
B. 
C. 
D. 
Solve the problem.If a, b, and c are all nonzero, then determine if the plane ax + by + cz = 1 always intersects all three coordinate planes (i.e. the planes x = 0, y = 0, z = 0), sometimes intersects them, or never intersects them.
A. Never B. Always C. Sometimes