Use the Gauss-Jordan method to solve the system of equations.3w + 3x - 3y - 3z = -4-w - 6x - 6y - z = -25w + 6x + 6y + 5z = -55w + 7x + 7y + 5z = 6
A. 
B. (-z, z, -z, z)
C. 
D. No solution
Answer: D
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Find the indicated control limits.For a production process for which there is a great deal of data since its last modification, the population mean ? and the population standard deviation ? are assumed known. For such a process we have the following values for an 
chart: 
(The value A is found in the table of control chart factors).In a chalk-producing factory, after production, the length of six sample pieces of chalk is checked every 15 minutes. For this process, ? = 3.67 in. and ? = 0.12 in. Find the central line, UCL, and LCL for the mean.
A. 3.67, 3.817, 3.523 B. 3.67, 3.806, 3.534 C. 3.67, 3.831, 3.509 D. 3.67, 3.728, 3.612
Provide an appropriate response.Factor completely: 4x2 - 49
Fill in the blank(s) with the appropriate word(s).
Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Solve.Find the area of the figure. Use 3.14 for ?.
A. 292.48 m2 B. 196.48 m2 C. 296.96 m2 D. Not enough data