Solve the equation after making an appropriate substitution.x6 - 26x3 = 27

A. {3, -1}
B. {27}
C. {-3, 1}
D. {3}

Answer: A

Mathematics

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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