Solve the system of equations by the substitution method. Check your solutions.
A. {(-4, -5), (-5, -4)}
B. {(4, -5), (5, -4)}
C. {(4, 5), (5, 4)}
D. {(-4, 5), (-5, 4)}
Answer: A
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Write as a fraction in simplest form.212
%
A. 2
B. 21
C. 4
D. 1
Evaluate the expression for the given values.
x = 1
A. - 2
B. 3
C. 6
D. 
Solve the problem.Ms. Jones installs and demonstrates smoke detectors. There are two smoke detectors that she installs, types A and B. Type A requires 1 hour to install and 
to demonstrate. Type B requires 
to install and 
to demonstrate. Company rules require Ms. Jones to work a minimum of 20 hours a week as an installer and a maximum of 15 hours a week as a demonstrator. She gets paid $8 an hour for installing and $5 an hour for demonstrating. For
each week, Ms. Jones chooses to install and demonstrate the number of alarms of each type so that her earnings are maximized.(a) Define the variables x and y.(b) Write the complete system of inequalities needed to solve the problem.(c) Write the objective function. What will be an ideal response?
Simplify.3 - 6(62 - 6 ? 4)
A. -69 B. -36 C. -717 D. 1080