Use the Laws of Exponents to simplify. Write the answer with positive exponents. All variables are nonzero.(7x-3y4)(7-1x6y-8)
A. - 
B. 
C. 
D. 
Answer: B
Mathematics
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Solve the problem.Pennies are packaged 50 in a roll. A mother broke open some rolls of pennies. She gave her son 
and she had 36 pennies left over. How many rolls of pennies did she break open?
A. 6 rolls B. 7 rolls C. 4 rolls D. 5 rolls
Mathematics
Simplify.7
+ 2
- 4
A. 7
B. -13
C. 17
D. 13
Mathematics
Use l'Hospital's rule, if applicable, to find the limit.
A. 16 B. 8 C. -16 D. -8
Mathematics
Write an integral giving the area of the surface obtained by revolving the curve about the x-axis. (Do not evaluate the integral.)
y = 2/x on [1, 5]
Mathematics