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. 16.7 L
B. 25 L
C. 20 L
D. 12.5 L
Answer: D
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Solve the problem. Round your answer to the nearest tenth, if necessary.Bill can row 3 mph in still water. It takes him 3 hr 36 min to go 3 mi upstream and then return. Find the speed of the current.
A. 2.5 mph B. 2 mph C. 3 mph D. 1.5 mph
Solve using the principle of zero products.b(b + 12) = 0
A. -12, 0 B. -1, -12 C. 1, -12 D. 12, 0
The amount of electricity used in a typical all-electric home is shown in the circle graph. If, in a certain month, a home used 2,000 kwh (kilowatt-hours), find the amounts of electricity used by the water heater from the graph.
?
?
A. 2,200 kwh B. 22,000 kwh C. 220 kwh D. 1,818 kwh E. 182 kwh
Simplify the expression. Express the answer so that only positive exponents occur. Assume that all variables are positive.
A. 
B. x201/140
C. 
D. x121/140