Solve the mixture 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. 5 L
B. 10 L
C. 6.7 L
D. 8 L
Answer: A
Mathematics
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Solve the problem.A room measures 15 ft by 
The ceiling is 
above the floor. The door measures 
by 
If a gallon of paint will cover 79.6 ft2, how many gallons of paint are needed to paint the room? Assume that the ceiling will be painted but not the door. Round your answer up to the next whole number.
A. 14 gal B. 24 gal C. 4 gal D. 10 gal
Mathematics
Find the derivative.y = 
A. 
B. 
C. 
D. 
Mathematics
Factor completely.2x3 + 6x2y - 20xy2 = 2x( 
)( 
)
A. x + 4y, x - 5y B. x + 2y, x - 5y C. x + 4xy, x - 5y D. x - 2y, x + 5y
Mathematics
Add or subtract as indicated.-87.59 + 170.66
A. -258.25 B. 258.25 C. 83.07 D. -83.07
Mathematics