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
and specifies that it must be in the proportion 80% iron and 20% magnese, so
From the first equation,
Substitute it into the second equation:
You are rigth because it just said that it is
Answer: 13°C
Step-by-step explanation:
Subtract 2 from 15.
(x<span> + </span>9)(x<span> – </span>1<span>) = 0. </span>x<span> = -</span>9<span> or </span>x<span> = </span><span>1</span>
Answer:
x=4
Step-by-step explanation:
-3x + 12x =36
Combine like terms
(-3+12)x = 36
9x = 36
Divide each side by 9
9x/9 = 36/9
x = 4
