Multiply. 
A. 20
B. 18
C. 16
D. 27
Answer: B
Mathematics
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Solve the problem.A merchant has coffee worth $40 a pound that she wishes to mix with 90 pounds of coffee worth $80 a pound to get a mixture that can be sold for $70 a pound. How many pounds of the $40 coffee should be used?
A. 30 lb B. 60 lb C. 15 lb D. 120 lb
Mathematics
Use the Laws of Exponents to simplify. Write the answer with positive exponents. All variables are nonzero. 
A. 
B. 
C. - 
D. - 
Mathematics
Perform the indicated operation by changing to scientific notation first. Express the solution in decimal notation.
A. -400,000,000,000,000 B. -4,000,000,000,000,000 C. -40,000,000,000,000 D. -400,000,000,000
Mathematics
Solve.4
= 
A. 6 B. 3 C. 18 D. empty set solution
Mathematics