Solve the system of equations.
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(–20, 12)
Section: 10.1
Mathematics
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Solve and check.
+ 
= 
A. -3, -4 B. 4, 3 C. -6, 5 D. no solution
Mathematics
Perform the indicated operation.4 + (-2)
A. 2 B. -2 C. -6 D. 6
Mathematics
Solve the problem.The volume V of a 19-gram object varies inversely with the density ? in grams per milliliters, 
Find 
A. 19 B. 1 C. ? D. 0
Mathematics
Solve the problem.A product sells by word of mouth. The company that produces the product has noticed that revenue from sales is given by 
where x is the number of units produced and sold. If the revenue keeps changing at a rate of 
per month, how fast is the rate of sales changing when 100 units have been made and sold? (Round to the nearest dollar per month.)
A. $2667/month B. $1333/month C. $24,000/month D. $27/month
Mathematics