Solve the problem.Two coins are tossed 20 times and the number of tails is observed.
Compute the empirical probability that exactly one tail occurred.
A. 0
B. 
C. 
D. 
Answer: A
Mathematics
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Decompose into partial fractions.
A. 
- 
B. 
+ 
C. 
- 
D. 
- 
Mathematics
Solve the problem.Behemoth Back Packs, Inc. finds that the cost to make each of its backpacks is $20 and each backpack sells for $79. If the company's fixed costs for a month are $7723, how many backpacks must the company sell in a month in order to make a profit?
A. at least 131 backpacks B. at most 75 backpacks C. at least 79 backpacks D. at least 146 backpacks
Mathematics
Use Fundamental Identities and/or the Complementary Angle Theorem to find the exact value of the expression. Do not use a calculator.cos 25°sin 65° + sin 25°cos 65°
A. -1 B. 2 C. 0 D. 1
Mathematics
Combine like terms.-7x3y4 + 8x3y4 - 9x3y4 - 4x3y4 + 8x3y4
A. Can't be simplified B. 10x3y4 C. -20x3y4 D. -4x3y4
Mathematics