Find all numbers for which the rational expression is not defined.
A. x = 6 and x = -6
B. x = 7 and x = 6
C. x = 0
D. x = -7 and x = -6
Answer: B
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Estimate. Then find the actual product.(71.61)(19.21)
A. Estimate: 1410; Actual: 1374.6281 B. Estimate: 140; Actual: 13,756.281 C. Estimate: 1400; Actual: 1375.6281 D. Estimate: 140; Actual: 137.56281
Find the exact value of the expression. Do not use a calculator.cot 45° - sin 45°
A. - 
B. 
C. 
D. 
Solve the problem.A lumber yard has fixed costs of $2228.70 per day and variable costs of $0.54 per board-foot produced. Lumber sells for $2.24 per board-foot. How many board-feet must be produced and sold daily to break even?
A. 801 board-feet B. 874 board-feet C. 4127 board-feet D. 1311 board-feet
Solve the inequality.(a + 7)(a + 5)(a + 4) > 0
A. (-4, ?) B. (-7, -5) or (-4, ?) C. (-?, -5) D. (-?, -7) or (-5, -4)