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
Answer: C
Mathematics
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Solve by completing the square.x2 + 3x - 9 = 0
A. 
B. 
C. 
D. -3 ± 3
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A. 72 B. 72x C. 72 - x D. x - 72
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A. 191.198 B. 191.197 C. 191.098 D. 191.188
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Find the indicated angle.Find the complement of 72°.
A. 108° B. 18° C. 288° D. 198°
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