Solve the system of equations by using the inverse of the coefficient matrix. x + y + z = -9 x - y + 4z = -85x + y + z = -13
A. (-3, -1, -5)
B. (-3, -5, -1)
C. (-1, -5, -3)
D. No inverse, no solution for system
Answer: C
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The life expectancy 
, measured in years, of a child born 
years after 2003 is given by
.
?
If one child is born 5 years after another, how much greater is the life expectancy? Assume that both children are born after 2003, so the formula above applies.
?
A. 1.51 years
B. 0.90 years
C. 5.66 years
D. 0.18 years
Solve the problem by integration.Find the first-quadrant area bounded by 
and 
A. 
ln 
B. 12 ln 
C. 
ln 
D. 
ln 
Provide an appropriate response.
Find the area of triangle ABC. Round to four significant digits. 
A. 367.4 m2 B. 238.8 m2 C. 183.7 m2 D. 119.4 m2
Translate the problem to a system of equations, then solve using Cramer's Rule.Twice the water flow in the hot-water pipe is the same as three times the flow in the cold-water pipe. The combined flow is 1200 liters per hour. What is the flow in each pipe?
A. 600 liters/hr hot, 400 liters/hr cold B. 400 liters/hr hot, 600 liters/hr cold C. 720 liters/hr hot, 480 liters/hr cold D. 480 liters/hr hot, 720 liters/hr cold