Evaluate the expression without a calculator.ln e-7
A. - 
B. 1
C. -7
D. e ln -7
Answer: C
Mathematics
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Find the number of proper subsets of the set.{x | x is a day of the week}
A. 64 B. 128 C. 127 D. 256
Mathematics
Express the sum using summation notation.
+ 
+ 
+ ... + 
A. 
B. 
C. 
D. 
Mathematics
Find the reciprocal.
A. 
B. 
C. 4
D. 
Mathematics
Solve the system of equations.5x - 4y + 10z = 810x + 2y - 15z = 2015x - 2y + 10z = 7
A. 
B. 
C. 
D. 
Mathematics