Solve the problem.It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 70 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
A. 28 L
B. 17.5 L
C. 23.3 L
D. 35 L
Answer: B
Mathematics
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?Find the volume of a cube of dimension: s = 7 dm if a cube of dimension: s = 4 dm is cut out of it.
A. ?V = 27 dm3 B. ?V = 279 dm3 C. ?V = 343 dm3 D. ?V = 407 dm3 E. ?None of the above.
Mathematics
Find the equation of the circle from the given information.Center at (1, -5), radius 
A. (x - 5)2 + (y + 1)2 = 169 B. (x + 1)2 + (y - 5)2 = 13 C. (x - 1)2 + (y + 5)2 = 13 D. (x + 5)2 + (y - 1)2 = 169
Mathematics
Provide an appropriate response.Perform the indicated operations without a calculator: $31,547 - $23,999 =
A. $8,758 B. $18,758 C. $7,548 D. $7,558
Mathematics
Evaluate the expression.61
A. 
B. 6
C. 1
D. -6
Mathematics