Solve the system by the addition method.-2x - 5y = -175x - 3y = -4
A. {(-1, 3)}
B. {(1, -3)}
C. {(1, 3)}
D. {(-1, -3)}
Answer: C
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Solve the problem.A 2000-L tank is initially filled with a copper sulfate solution with a concentration of 50 g/L. A copper sulfate solution with a concentration of 20 g/L flows into the tank at a rate of 15 L/min. The thoroughly mixed solution is drained from the tank at a rate of 15 L/min.(a) Write an initial value problem for the mass of the copper sulfate.(b) Solve the initial value problem.
A. (a) m'(t) = -0.007m + 300, m(0) = 100,000 (b) m = 60,000e-0.007t + 40,000 B. (a) m'(t) = -0.007m + 20, m(0) = 50 (b) m = -39,950e-0.007t + 40,000 C. (a) m'(t) = 0.008m + 300, m(0) = 50 (b) m = -39,950e0.008t + 600,000 D. (a) m'(t) = -133.333m + 300, m(0) = 100,000 (b) m = 60,000e-0.007t + 600,000
For the following question(s), refer to the digraph below.
Which of the following is not a cycle in the digraph?
A. E, D, B, E B. B, C, B, E, D, B C. A, B, E, A D. A, C, B, E, A E. all of these are cycles in the digraph.
Simplify by finding the absolute value.?-17?
A. 17 B. 34 C. -17 D. 0
Solve the equation.2(6w + 8) = 4(2w + 12)
A. {8} B. {-4} C. {4} D. {16}