Alright! First you'd subtract the amount of the part ($44) from your total ($179), then you'd divide by the rate of cost ($45). Your equation would be:
($179 - $44) ÷ $45 = h.
Then you solve:
($179 - $44) = $135
($135 ÷ $45) = 3
h = 3.
The answer is 3 hours.
Answer:
3 x -3y = -9y
3 x -1 = -3
The factored expression is 3(-3y - 1)
Step-by-step explanation:
All you have to do is -9y / 3 = -3y and -3 / 3 = -1, then put those numbers in parentheses. All of that is multiplied by 3.
The reason is because if you distributed the 3 it would become:
3 * -3y + 3 * -1 = -9y - 3
Compare the impure one, with the rest of the pure gold ones.
i think.
I assume you have to balance the reaction?
<em>a</em> Fe + <em>b</em> H₂SO₄ → <em>c</em> Fe₂(SO₄)₃ + <em>d</em> H₂
Count the number of times an element occurs on either side of the reaction. These numbers must be equal.
Fe: <em>a</em> = 2<em>c</em>
H: 2<em>b</em> = <em>d</em>
S: <em>b</em> = 3<em>c</em>
O: 4<em>b</em> = 12<em>c</em>
Two of these equations depend on <em>c</em>, so we can treat it as a free variable. Let <em>c</em> = 1. Then <em>a</em> = 2 (Fe) and <em>b</em> = 3 (S), from which it follows that <em>d</em> = 6 (H). So the balanced reaction is
2 Fe + 3 H₂SO₄ → 1 Fe₂(SO₄)₃ + 6 H₂
