Use Gaussian elimination or Gauss-Jordan elimination to solve the problem.Anne and Nancy use a metal alloy that is 20.45% copper to make jewelry. How many ounces of a 12% alloy must be mixed with a 25% alloy to form 100 ounces of the desired alloy?
A. 37 oz
B. 35 oz
C. 65 oz
D. 70 oz
Answer: B
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Solve the problem.The value of a certain make and model of used car can depend on several factors. The table gives data for the values of three Chevy Caprice station wagons. The value V is measured in dollars, where A is the age of the car in years, and C is the condition of the car rated on a scale of 1 to 10 (10 is excellent condition).
The variables are found to be related by the equation 
Use the information given in the table to write a matrix equation which when solved will yield the values of a, b, and c. Then, using the fact that the inverse of the
matrix 
is 
, find b.
A. b = 2600
B. b = -1600
C. b = - 1400
D. b = 2200
Solve the inequality and express the solution set in interval notation. Graph the solution set on the real number line.
? 
+ 1
A. x ? 4; (-?, 4]
B. x ? 4; [4, ?)
C. x > 4; (4, ?)
D. x ? -4; [-4, ?)
Evaluate.-(-|-(-7)|)
A. -7 B. 7 C. -1 D. 1
Perform the operation indicated. Simplify.
- 
A. 
B. 
C. 
D. 