Solve the problem. Use 3.14 as the approximate value of ?. Round to the nearest tenth unless otherwise indicated.The foundation for a cylindrical water tank is a cylinder 21 in in diameter and 3 in high. How many cubic in of concrete are needed to build the foundation?
A. 4,154.2 in3
B. 395.6 in3
C. 2,077.1 in3
D. 1,038.6 in3
Answer: D
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Solve the problem.The resistance R produced by wiring resistors of R1, R2, and R3 ohms in parallel can be calculated from the formula 
If R1, R2, and R3 are measured to be 3 ohms, 10 ohms, and 8 ohms respectively, and if these measurements are accurate to within 0.05 ohms, estimate the maximum possible error in computing R.
A. 0.018 B. 0.013 C. 0.022 D. 0.026
Estimate the sum or difference by first rounding to the nearest ten.64
A. 160 B. 158 C. 200 D. 150
Solve the system of equations.
A. x = z - 2, and y = -3z - 5, where z is any real number or {(x, y, z) |x = z - 2, and y = -3z - 5, where z is any real number} B. x = -3z - 5, and y = z + 2, where z is any real number or {(x, y, z) |x = -3z - 5, and y = z + 2, where z is any real number} C. x = 3z + 5, and y = z - 2, where z is any real number or {(x, y, z) |x = 3z + 5, and y = z - 2, where z is any real number} D. inconsistent
Solve the problem.Find an equation in general form for the line graphed on a graphing utility. 
A. y = - 
x - 1
B. x + 2y = -2
C. 2x + y = -1
D. y = -2x - 1