Recognize the elementary row operation used and determine the missing entry.
? 
A. 12
B. - 
C. 
D. -12
Answer: B
You might also like to view...
A right triangle with acute angle ? is given. Evaluate the indicated trigonometric function of the acute angle ?.Find sec ?.
A. 
B. 
C. 
D. 
Convert the units using unit fractions.1
ft = 
in.
A. 18
B. 
C. 20
D. 
Complete the ordered pairs for the equation.4x + y = -27 (-9, ) (0, ) (1, )
A. (-9, 9) (0, -27) (1, -31) B. (-9, 9) (0, 27) (1, -31) C. (-9, -63) (0, -27) (1, -31) D. (-9, -45) (0, -27) (1, -31)
Solve the problem.A person with no more than $2000 to invest plans to place the money in two investments, telecommunications and pharmaceuticals. The telecommunications investment is to be no more than 5 times the pharmaceuticals investment. Write a system of inequalities to describe the situation. Let 
to be invested in telecommunications and 
to be invested in pharmaceuticals.
A. x + y ? 2000 x ? 5y x ? 0 y ? 0 B. x + y ? 2000 5x ? y x ? 0 y ? 0 C. x + y = 2000 y ? 5x x ? 0 y ? 0 D. x + y = 2000 x ? 5y x ? 0 y ? 0