Solve the problem using two linear equations in two variables and Cramer's rule.Two different gasohol mixtures are available. One contains 5% alcohol and the other 12% alcohol. How much of each should be mixed to obtain 1500 gal of gasohol containing 10% alcohol? (Round to the nearest whole gallon.)
A. 625 gal 5%, 875 gal 12%
B. 75 gal 5%, 180 gal 12%
C. 1071 gal 5%, 1071 gal 12%
D. 429 gal 5%, 1071 gal 12%
Answer: D
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A. -5x B. -4x C. -3x D. -4x - x
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Add or subtract as indicated.Add.
A. -7m + 20m + 5 B. -34m - 20m - 5 C. 3m2 + 2m + 11 D. -33m2 - 2m - 11
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A. (-6, 6) B. [-6, 6] C. [-6, 6) D. (-6, 6]