Solve for the unknown quantity.
= 
A. t = 
B. t = 10
C. t = 5
D. t = 4
Answer: D
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Solve the equation by factoring.x2 + x - 42 = 0
A. {6, 7} B. {-7, -6} C. {-7, 6} D. {-6, 7}
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 R chart: 
(The values of d2, D1, and D2 are 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, ? = 3.73 in. and ? = 0.15 in. Find the central line, UCL, and LCL for the range.
A. 0.380, 0.780, 0.031 B. 0.380, 0.762, 0.000 C. 0.406, 0.780, 0.031 D. 0.349, 0.738, 0.000
Determine whether the players have equal probabilities of winning.Toss two fair dice numbered 1 through 6. If the sum is even, player 1 wins; if the sum is odd, player 2 wins.
A. Yes B. No
Solve the problem.In the formula L = L0
, L0 is the length of an object in a spaceship moving at velocity v and c is the velocity of light. (a) A spaceship is moving away from Earth at a velocity of v = 0.70c. What is the length of a meter stick in the spaceship as it appears to an observer on Earth? Round your answer to the nearest tenth of a meter if necessary. (b) Find 
L.
A. (a) 0.8 m, (b) does not exist B. (a) 0.2 m, (b) 1 C. (a) 0.5 m, (b) -1 D. (a) 0.7 m, (b) 0