The reduced row echelon form of the augmented matrix of a system of equations is given. Find the solutions of the system. 
A. No solution
B. (3, 8, 6, -6)
C. (3, 8, 6, -6, 1)
D. (3, 8, 6, -6, w) for any real number w
Answer: A
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Find, if possible, the number of elements in sets A, B, and C using the given information.n(A - C) = 10n(C - A) = 3n(A ? B) = 8n(C ? A) = 8n(C ? B) = 6n(B - A) = 8n(A ? B ? C) = 4
A. n(A) = 11, n(B) = 27, n(C) = 18 B. n(A) = 22, n(B) = 20, n(C) = 15 C. n(A) = 18, n(B) = 16, n(C) = 11 D. The information is inconsistent or incomplete.
Perform the indicated operation.(4n7 - 6n + 3n5) + (9n5 + 8n7 + 7n)
A. 12n7 + 12n5 + 1n B. 2n7 + 13n5 + 10n C. 25n13 D. 12n + 12n7 + 1n5
Solve the problem.On average, 10.4 % of the money consumers spend in supermarkets in England goes to the purchase of snacks and baked goods, which is four times the percent of money spent on cereals and rice. What percentage of the money spent by consumers in England's supermarkets is for the purchase of cereal and rice?
A. 1.3% B. 3.1% C. 3.6% D. 2.6%
Use the properties of logarithms to find the exact value of the expression. Do not use a calculator.2 ln e4.2
A. 4.2 B. 2.1 C. 8.4 D. e8.4