Rewrite the fractions using the least common denominator.
and 
A. 
and 
B. 
and 
C. 
and 
D. 
and 
Answer: A
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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
Decide whether the statement is true or false.1 is a solution of -8x + 9x = 1.
A. True B. False
Solve the number problem by finding the value of the unknown number.If twice a number is increased by 1, the result is 23.
A. 22 B. 11 C. 16 D. 8
Complete the graph by shading the correct region.2x + 5y ? -10
A. 
B. 
C. 
D. 