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Sphinxa [80]
4 years ago
15

Which of these equations shows rust, Fe2O3, forming when oxygen, O2, reacts with iron, Fe? Question 10 options: 2Fe2O3 → 3O2 + 4

Fe 4Fe → 3O2 + 2Fe2O3 3O2 + 4Fe → 2Fe2O3 2Fe2O3 + 4Fe → 3O2
Mathematics
1 answer:
mrs_skeptik [129]4 years ago
6 0

Answer:

The rusting of iron is represented by the equation 4Fe +3O2 --> 2Fe2O3.

Step-by-step explanation:

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A right triangle has legs with lengths 20 cm and 21 cm.
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to find the hypotenuse length you need to use the pythegorian therum and that will give you 29cm


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The correct answer is x=4
5 0
3 years ago
What is the value of b in the equation 3b + 2(b - 1) =8
WARRIOR [948]

Answer:

b = 2

Step-by-step explanation:

In order to find the value of b, we have to isolate b on one side of equation first

So,

3b+2(b-1)=8

Multiplying 2 with b-1

3b+2b-2=8\\5b-2=8

Adding 2 on both sides

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6 0
3 years ago
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A number d minus is less than -1
katrin [286]

\boxed{d-4

<h2>Explanation:</h2>

Hello! Recall you need to write complete questions in order to find exact answers. So in this problem I'll assume the question is:

<em>A number d minus 4 is less than -1</em>

<em />

So it is easy to know that we need to write an inequality here because of the words "less than", which implies that we must use the symbol <. So let's solve this step by step.

Step 1. A number d minus 4.

This statement includes the word "minus", so we need to use the symbol (-). Therefore:

d-4

Step 2. A number d minus 4 is less than

As we said above, here we need to use the symbol (<). So:

d-4

Step 3. A number d minus 4 is less than -1

Finally, we get:

d-4

<h2>Learn more:</h2>

Inequalities: brainly.com/question/9611462

#LearnWithBrainly

3 0
3 years ago
A cylinder with a radius of 1 cm and a height of 21 cm has the same volume as a cone with a height of 7 cm. What is the radius o
Maru [420]
Volume of the cylinder = πr²h = π(1)² (21) = 21π cm³

Volume of the cone = 1/3 π r² h

21π = 1/3 π (r)² (7)

r³ = 21π ÷ (7/3 π) 

r² = 9

r = 3

Answer : Radius = 3
3 0
3 years ago
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