Solve the problem.The radiator in a certain make of car needs to contain 
of 40% antifreeze. The radiator now contains 
of 20% antifreeze. How many liters of this solution must be drained and replaced with 100% antifreeze to get the desired strength?
A. 12 L
B. 7.5 L
C. 15 L
D. 10.0 L
Answer: B
Mathematics
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Substitute the given values into the formula and then evaluate to find the unknown quantity. Label units in your answer. If the answer is not exact, round your answer to the nearest hundredth.d = rt; t = 9, d = 54
A. 0.2 B. 6 C. 45 D. 63
Mathematics
Find the derivative.y = 8 - 3x3
A. -6x2 B. 8 - 9x2 C. -9x2 D. -9x
Mathematics
Multiply.(x + 12)2
A. x + 144 B. 144x2 + 24x + 144 C. x2 + 144 D. x2 + 24x + 144
Mathematics
Solve the equation.
- 
= 0
A. 
B. 
C. 
D. 
Mathematics