Solve the following system of equations by substitution. If both variables cancel out, state the solution as no solution or infinitely many solutions.- 
x + y = 10x - 3y = 30
A. (30, 0)
B. infinitely many solutions
C. (0, -10)
D. no solution
Answer: D
Mathematics
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Solve.Plagiarism Copiers, Inc., is planning a new desktop copier. For the first year, the fixed cost of setting up the production line is $25,600. The variable cost for producing each copier is $560. The revenue from each copier is $420. Find the profit or loss from the production and sale of 4200 copiers.
A. $613,600 loss B. $562,400 loss C. $105,756,560 loss D. $4,090,400 loss
Mathematics
Using the variable x, write the interval as an inequality.
A. x > 
B. x ? 
C. x < 
D. 9 ? x ? 7
Mathematics
Perform the indicated operation.
÷ 
A. 
B. 
C. 
D. 
Mathematics
Find the indicated coefficient or term.The 8th term in the expansion of (3x - 2y)9
A. -13,824x7y2 B. 20,736x7y2 C. 20,736x2y8 D. -41,472x2y7
Mathematics