Translate the problem to a system of equations, then solve using matrices.How many liters (L) of a 10% alcohol solution must be mixed with 30 L of a 70% solution to get a 40% solution?
A. 60 L
B. 30 L
C. 6 L
D. 3 L
Answer: B
Mathematics
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Determine the number of terms in the expression and then list the coefficients for each term.94x3 + x2
A. 2 terms: 94x3 and x2; coefficients: 3, 2 B. 1 term: 94x3 + x2; coefficient: 5 C. 2 terms: 94x3 and x2; coefficients: 94, 1 D. 1 term: 94x3; coefficient: 94
Mathematics
Solve the system by the substitution method.xy - x2 = -20x - 2y = 3
A. 
B. 
C. 
D. 
Mathematics
Apply the distributive law.7(x + 8)
A. 7x + 56 B. x + 56 C. 7x + 15 D. 7x + 8
Mathematics
The graph of either a cubic or quartic polynomial f(x) with leading coefficient ±1 and integer zeros is shown. Write the complete factored form of f(x).
A. f(x) = (x + 3)2(x - 1)(x - 3)2 B. f(x) = (x2 - 1)(x2 - 9) C. f(x) = (x + 3)(x - 1)2(x - 3) D. f(x) = (x - 3)(x + 1)2(x + 3)
Mathematics