Solve the problem.It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 20 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
A. 8 L
B. 6.7 L
C. 5 L
D. 10 L
Answer: C
Mathematics
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Use a calculator to approximate the root to the nearest thousandth.
A. 3.018 B. 3.050 C. 3.032 D. 3.040
Mathematics
Insert parentheses in order to make the statement true. More than one set of parentheses may be needed.2 + 4 ? 9 - 4 = 30
A. 2 + 4 ? (9 - 4) = 30 B. (2 + 4) ? 9 - 4 = 30 C. 2 + (4 ? 9 )- 4= 30 D. (2 + 4) ? (9 - 4) = 30
Mathematics
If a triangle has vertices of 
and 
then the area of the triangle is given by 
Find the area of the triangle with vertices at the given points.(1, -3) (1, 1) (4, 3)
A. 6 B. 2.5 C. 12 D. 5
Mathematics
Use a calculator to find a graphical solution to the equation. Express results to the nearest thousandth.7n2 = -6n - 1
A. -0.286, -0.571 B. -0.655, -1.059 C. -0.227, -0.631 D. -0.113, -0.315
Mathematics