Use the inverse of the coefficient matrix to solve the system of equations. y + z = 5,3x -z = 8, 2x + y + 3z = 9; A-1 = - 
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Divide.
A. -84,061.65 B. -8.406165 C. -8,406.165 D. -84.06165
Mathematics
Solve the problem.If cos A = 
and 
, with A in quadrant I and B in 
, then find sin(A - B).
A. 
B. 
C. 
D. 
Mathematics
Write the percent as a decimal. Round to the nearest thousandth if the division does not terminate.
%
A. 780 B. 0.078 C. 0.0078 D. 0.78
Mathematics
Solve the problem.The half-life of a certain radioactive substance is 10 years. Suppose that at time t = 0 , there are 29 g of the substance. Then after t years, the number of grams of the substance remaining will be 
How many grams of the substance will remain after 80 years? Round to the nearest hundredth when necessary.
A. 0.91 g B. 0.23 g C. 1.81 g D. 0.45 g
Mathematics