The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using back-substitution.
A. ?
B. {(3, 1)}
C. {(1, -2)}
D. {(-2, 1)}
Answer: A
Mathematics
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Solve the problem.At lift-off, a rocket weighs 40.3 tons, including the weight of fuel. It is fired vertically, and the fuel is consumed at the rate of 2.16 tons per 1,000 ft of ascent. How much work is done in lifting the rocket to an altitude of 10,000 ft?
A. 5.11 x 105 ft?ton B. 2.95 x 105 ft?ton C. 3.31 x 105 ft?ton D. 3.49 x 105 ft?ton
Mathematics
Write the terms for the partial fraction decomposition of the rational function. Do not solve for the constants.
A. 
+ 
B. 
+ 
+ 
C. 
+ 
+ 
+ 
D. 
+ 
Mathematics
Graph the function. Use the graph to find the indicated limit, if it exists.
f(x), f(x) = 
A. 9 B. does not exist C. 3 D. -9
Mathematics
Divide and write the answer in simplest form.125 ÷ (-5)
A. 25
B. - 
C. -35
D. -25
Mathematics