Solve the problem.Anne and Nancy use a metal alloy that is 13% copper to make jewelry. How many ounces of an alloy that is 11% copper must be mixed with an alloy that is 16% copper to form 55 ounces of the desired alloy?
A. 27 ounces
B. 33 ounces
C. 22 ounces
D. 35 ounces
Answer: B
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Express the set using set-builder notation. Use inequality notation to express the condition x must meet in order to be a member of the set.A = {12, 13, 14, 15, 16,...}
A. {x | x ? N and x ? 12} B. {x | x ? N and x ? 12} C. {x | x ? N and x ? 16} D. {x | x ? N and x > 12}
Solve the system.4x + 5y + z = -335x - 3y - z = -93x + y + 4z = -23
A. {(-4, -3, -2)} B. {(-4, -2, -3)} C. ? D. {(-2, -3, -4)}
Solve the problem.There are 8580 under-capitalized retail stores. If this represents 29% of the total number, what is the total number? Round to the nearest whole number.
A. 248,800 B. 2488 C. 296 D. 29,586
Use the laws of exponents to simplify each expression using positive exponents only. Assume all variables represent nonzero real numbers.(x-6)-3
A. 
B. x18
C. -x9
D. 