Translate the problem to a system of equations, then solve using 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 500 gallons of gasohol containing 10% alcohol?
A. 208 gal 5%, 292 gal 12%
B. 143 gal 5%, 357 gal 12%
C. 357 gal 5%, 357 gal 12%
D. 25 gal 5%, 60 gal 12%
Answer: B
Mathematics
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Solve.(x - 7)(x + 3) ? 0
A. (-?, -3] ? [7, ?) B. (7, ?) C. (-?, -7] ? [3, ?) D. (7, -3)
Mathematics
A. 
B. 7 - a2
C. 7
D. 
Mathematics
R1 = 55 Kê, R2 = 5.5 Kê, R3 = 2.2 Kê, R4 = 0.51 Kê, HFE = 90, and VCC = 18 V. Find VOC and RTH.
a. 20.15 æA
b. 61.8 æA
c. 89.2 æA
d. 94.9 æA
e. 100.6 æA
Mathematics
Use a calculator to evaluate the expression. Round the answer to three decimal places.(-0.55)-2
A. 0.303 B. -3.306 C. 3.306 D. -0.302
Mathematics