Perform the matrix operation.Let B = 
. Find -4B.
A. 
B. 
C. 
D. 
Answer: D
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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
Solve.Sue buys a house which has a rectangular yard measuring 10.3 meters by 11.3 meters. In one corner of the yard is a rectangular shed measuring 3.7 meters by 3.5 meters. Sue intends to grow grass in the whole of the yard. What is the area of the yard excluding the shed?
A. 3.7 m2 B. 1034.4 m2 C. 103.44 m2 D. 116.39 m2
Evaluate using a number line.9 + (-1) 
A. -8 B. 8 C. -10 D. 10
Add or subtract.(3.77x5 + 2x3 + 5.04x - 7.52) - (7.34x4 + 0.74x2 + 7.02x - 4)
A. 3.77x5 + 7.34x4 + 2x3 - 0.74x2 - 1.98x + 3.52 B. 3.77x5 + 7.34x4 + 2x3 + 0.74x2 - 1.98x + 3.52 C. 3.77x5 - 7.34x4 + 2x3 + 0.74x2 + 1.98x - 3.52 D. 3.77x5 - 7.34x4 + 2x3 - 0.74x2 - 1.98x - 3.52