Amount of fuel in the tank before the story begins . . . . . zero.
Total amount poured in . . . . . 3/4 gallon.
Total amount burned:
on Friday . . . . . 1/4 gallon
on Sunday . . . . 1/4 gallon
Total used . . 1/2 gallon .
Amount remaining in the tank on Monday:
(3/4 gallon in) - (1/2 gallon burned) = 1/4 gallon left.
==> NOT empty
The tank would have been empty on Monday IF Becky
had poured in only 1/2 gallon, instead of 3/4 of a gallon
before the first flakes began to fly.
Answer:
Thank you
Step-by-step explanation:
Have a great day :D
Answer:
tons of high steel and
tons of low steel
Step-by-step explanation:
Let x be the number of tons of high grade steel and y be the number of tons ow low grade steel needed.
In x tons of high grade steel there are
tons of iron
tons of magnese
In y tons of low grade steel there are
tons of iron
tons of magnese
NASA orders 500 tons of steel, so
![x+y=500](https://tex.z-dn.net/?f=x%2By%3D500)
and specifies that it must be in the proportion 80% iron and 20% magnese, so
![0.85x+0.67y=500\cdot 0.8\\ \\0.85x+0.67y=400](https://tex.z-dn.net/?f=0.85x%2B0.67y%3D500%5Ccdot%200.8%5C%5C%20%5C%5C0.85x%2B0.67y%3D400)
From the first equation,
![x=500-y](https://tex.z-dn.net/?f=x%3D500-y)
Substitute it into the second equation:
![0.85(500-y)+0.67y=400\\ \\425-0.85y+0.67y=400\\ \\-0.18y=-25\\ \\y=\dfrac{2,500}{18}=138\dfrac{8}{9}\ tons\\ \\x=361\dfrac{1}{9}\ tons](https://tex.z-dn.net/?f=0.85%28500-y%29%2B0.67y%3D400%5C%5C%20%5C%5C425-0.85y%2B0.67y%3D400%5C%5C%20%5C%5C-0.18y%3D-25%5C%5C%20%5C%5Cy%3D%5Cdfrac%7B2%2C500%7D%7B18%7D%3D138%5Cdfrac%7B8%7D%7B9%7D%5C%20tons%5C%5C%20%5C%5Cx%3D361%5Cdfrac%7B1%7D%7B9%7D%5C%20tons)
Answer:
-5
Step-by-step explanation: