Find the indicated probability.A sample of 4 different calculators is randomly selected from a group containing 38 that are defective and 23 that have no defects. What is the probability that all four of the calculators selected are defective?
A. 8.3360
B. 0.1506
C. 0.1414
D. 0.1342
Answer: C
Mathematics
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Find the directrices of the ellipse.25x2 + 36y2 = 900
A. y = ± 
B. x = ± 
C. y = ± 
D. x = ± 
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Multiply.
A. 
- 5y2
B. 
- 25y2
C. 
+ 25y2
D. 
- 25y
Mathematics
Find the average of the pair of numbers.
, 
A. 
B. 
C. 
D. 
Mathematics
Find the indicated sum.Find the sum of the first 50 terms of the arithmetic sequence: 5, -4, -13, -22, . . .
A. -10,767 B. -10,775 C. -11,000 D. -445
Mathematics