Determine whether the matrix is in row-echelon form. If it is, then determine also whether it is in reduced row-echelon form.
A. Yes; yes
B. Yes; no
C. No
Answer: C
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The graph of a linear equation:
a. Is a straight line b. Always passes through the origin c. Is a curved line d. Can be either a straight or curved line e. Is always a vertical line
Solve. Write each fraction in simplest form.There are 5280 feet in a mile. What fraction of a mile is represented by 792 feet?
A. 
B. 
C. 
D. 
Solve the system of nonlinear equations.x2 + y2 = 89x2 - y2 = -39
A. (5, -8), (5, 8) B. (-5, -8), (-8, -5) C. (5, 8), (-5, 8), (5, -8), (-5, -8) D. (5, 8), (8, 5), (-5, -8), (-8, -5)
Solve the problem. Use ? ? 3.14.The foundation for a cylindrical water tank is a cylinder 21 m in diameter and 3 m high. What volume of concrete is needed to build the foundation? Round your answer to the nearest tenth if necessary.
A. V ? 4154.2 m3 B. V ? 2077.1 m3 C. V ? 395.6 m3 D. V ? 1038.6 m3