?Seven hundred gallons of 89-octane gasoline is obtained by mixing 87-octane gasoline with 92-octane gasoline. How much of each type of gasoline is required to obtain the 700 gallons of 89-octane gasoline? Use this system of linear equations there x and y represent the number of gallons of the 87-octane gasoline and 89-octane gasoline.
?
?
?
A. 87?-octane: 89 gal; 92-octane: 280 gal ?
B. 87?-octane: 280 gal; 92-octane: 420 gal?
C. 92??-octane: 89 gal; 87-octane: 280 gal
D. ??87-octane: 420 gal; 92-octane: 280 gal
E. ??92-octane: 280 gal; 87-octane: 89 gal
Answer: D
You might also like to view...
The length of skid marks when a car skids to a stop is a power function of the speed the car is traveling when the brakes are applied. The value of the power in this function is 
. If the speed is multiplied by 2.59, how is the skid mark length affected? Round your answer to two decimal places if necessary.??
A. Speed is multiplied by 6.02. B. Speed is multiplied by 6.71. C. Speed is multiplied by 7.69. D. Speed is multiplied by 6.46.
Use the equation  figures 4.png)
to find  figure.png)
 multiple choice.png)
Find the product and simplify, if possible.
? 
A. 
B. 
C. 2
D. 4
Solve the problem.The amount of alcohol in the bloodstream, A, declines at a rate proportional to the amount, that is, 
. If 
for a particular person, how long will it take for his alcohol concentration to decrease from 0.10% to 0.05%? Give your answer to the nearest tenth of an hour.
A. 2.6 hr B. 1.7 hr C. 0.3 hr D. 3.5 hr