Solve the system of equations using the addition method. 5x - 7y = 2-10x + 14y = -6
A. (2, 3)
B. no solution
C. 
D. (5, 2)
Answer: B
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Solve the problem.Acetylene is a solvent frequently used to clean lubricants from machine components. Once used, the dirty solvent need not be discarded. It may be distilled to recover pure acetone from the soiled mixture. During a distillation cycle, 65% of the acetone can be recovered. Calculate the effective volume of 1 liter of acetone. [The effective volume is the original 1 liter plus the accumulated amount recovered from an infinite number of distillation cycles].
A. 2.857 L B. An infinite number of liters C. 1.538 L D. 1.650 L
Solve the problem.A biologist has a bacteria sample. She records the amount of bacteria every week for 8 weeks and finds that the exponential function of best fit to the data is A = 150 ? 1.79t. Express the function of best fit in the form 
What will be an ideal response?
Solve the problem.Jeremy's car gets 306 miles of highway driving on 9 gallons of gasoline. What is the mean number of miles expected per gallon -- that is, what is its gas mileage?
A.
| 33 mpg |
B. 35 mpg
C. 34 mpg
D.
| 36 mpg |
118 college students were interviewed to determine their political party affiliations and whether they favored a balanced-budget amendment to the Constitution. The results of the study are listed in the table, where D represents Democrat and R represents Republican. FavorNot favorUnsureTotalD2227655R506763Total723313118A person is selected at random from the sample. Find the probability that the described person is selected. A person who doesn't favor the amendment. Round your anser to one decimal place.
A. 28.8% B. 25.4% C. 27.9% D. 26.2% E. 28.0%