Solve the problem.How many gallons of a 30% alcohol solution must be mixed with 60 gallons of a 14% solution to obtain a solution that is 20% alcohol?
A. 7 gal
B. 27 gal
C. 36 gal
D. 12 gal
Answer: C
Mathematics
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Solve the problem.Suppose the cost per ton, f(x), to build an oil platform of x thousand tons is approximated by 
What is the cost per ton for x = 50?
A. $3250.00 B. $2925.00 C. $10.00 D. $433.33
Mathematics
Find the vertex of the parabola.
?
?
A. (2, -6) B. (-2, 2) C. (-2, -6) D. (-2, -4) E. (8, -6)
Mathematics
Solve.The area code for a phone number in a city can be either 813 or 218. The rest of the 7-digit phone number can be formed with the digits 0 through 9. How many phone numbers can the city have before it needs to have another area code?
A. 20,000,000 B. 1,000,000 C. 18,000 D. 130,000
Mathematics
Rationalize the denominator.
A. 6
+ 18
B. 
C. 6
- 3
D. 6
- 18
Mathematics