Graph the linear equation.x + y = -3
A. 
B. 
C. 
D. 
Answer: A
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Solve the problem.An exterminator activates an aerosol "fogger" in a large auditorium. The concentration of insecticide immediately afterwards can be modeled by the function C(x, y, z) = -0.0001 ln
,where x, y, and z are measured in feet from a particular floor-level corner of the room. To escape the insecticide, a flying insect located at 
needs to fly immediately in the direction of greatest decrease in concentration. Find the unit vector indicating the direction the insect should fly.
A. u = 
B. u = 
C. u = 
D. u = 
Express the number in scientific notation.4,200,000,000,000
A. 4.2 × 109 B. 4.2 × 1012 C. 4.2 × 10-12 D. 4.2 × 10-9
Solve the problem. Round to the nearest cent.John Lee's savings account has a balance of $2686. After 18 months, what will the amount of interest be at 4.9% per year?
A. $131.61 B. $149.22 C. $149.62 D. $197.42
Tell whether the statement is true or false.Let A = {2, 3, 4, 5, 6, 7}, B = {4, 6, 8}, C = {2, 3, 5, 7}, D = {2, 7}, and 
C ? A
A. True B. False