Solve the problem.How much pure acid should be mixed with 6 gallons of a 50% acid solution in order to get an 80% acid solution?
A. 15 gal
B. 3 gal
C. 24 gal
D. 9 gal
Answer: D
Mathematics
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Evaluate the integral.
A. 
csch (ln x) + C
B. x csch (ln x) + C
C. 
csch (ln x) + C
D. 2 sech (ln x) + C
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Find the volume of the indicated region.the tetrahedron bounded by the coordinate planes and the plane 
A. 16 B. 24 C. 8 D. 12
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At what points is the given function continuous?f(x, y) = 
A. All (x, y) B. All (x, y) such that 3x + 6y ? 0 C. All (x, y) such that x + y ? 0 D. All (x, y) such that 3x + 6y ? 0
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Find the sum of the sequence.
A. 120 B. 84 C. 30 D. 39
Mathematics