Solve.There are n people in a room. The number N of possible handshakes by all the people in the room is given by the function N(n) = 
. For what number n of people is 28 ? N ? 231 ?
A. {n|9 ? n ? 21}
B. {n|8 ? n ? 22}
C. {n|7 ? n ? 24}
D. {n|10 ? n ? 21}
Answer: B
Mathematics
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Write the number in scientific notation.4100 million
A. 41 × 108 B. 4.1 × 109 C. 4.1 × 103 D. 4.1 × 1010
Mathematics
Solve the problem.Subtract (7a5 + 2a2) from the sum of (2a5 + 6a2) and 
A. -3a10 - 3a4 B. -6a7 C. -6a14 D. -3a5 - 3a2
Mathematics
Use the substitution formula to evaluate the integral.
A. 
B. - 
C. 13
D. 26
Mathematics
Find the value(s) of the variable for which the rational expression is undefined.
A. 36
B. 6
C. 6, -6
D. 
Mathematics