Solve the problem.It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 50 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
A. 20 L
B. 16.7 L
C. 25 L
D. 12.5 L
Answer: D
Mathematics
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Graph the polar equation.r = 
A. 
B. 
C. 
D. 
Mathematics
Find a system of inequalities with the given graph.
A. y ? -x + 7 y ? 0 x ? 0 x ? 3 B. y ? -x + 7 y ? 0 x ? 0 x ? 3 C. y ? -x + 3 y ? 0 x ? 0 x ? 7 D. y ? -x + 7 x ? 3
Mathematics
Perform the operation. Write the answer as a fraction in lowest terms.
÷ 
A. 
B. 
C. 
D. 
Mathematics
Approximate the area under the curve and above the x-axis using n rectangles. Let the height of each rectangle be given by the value of the function at the right side of the rectangle.f(x) = 2x3 - 1 from x = 1 to x = 6; n = 5
A. 825 B. 800 C. 875 D. 850
Mathematics