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stiv31 [10]
3 years ago
13

Although a meteorite might travel millions of kilometers to reach earth the particles of iron in a meteorite are identical to th

e particles of iron an iron skillet because iron is a
pure substance
metalloid
mixture
compound

10 points!:)
Mathematics
1 answer:
Vikentia [17]3 years ago
6 0

Answer:

pure substance! I checked.

Step-by-step explanation:

In chemistry, a substance is pure if it has a homogeneous chemical composition. ... Examples of pure substances include iron, steel, and water. Air is a homogeneous mixture that is often considered to be a pure substance.

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5 0
2 years ago
Read 2 more answers
7. Which of these is equivalent to the expression 8+8+8+8+12?
LenKa [72]

Answer:

Step-by-step explanation:

There are four 8s, so s should represent one 8.

The 12 is made up of 4 * 3, so B should be the answer.

Answer: B or 4(s + 3)

When the brackets are removed, you get 4s + 12

4 0
2 years ago
Solve by completing a square r^2-8r+9
Tanzania [10]

Solving  r^2-8r+9 by completing a square gives (r+4)^2-7

Step-by-step explanation:

We need to solve the equation r^2-8r+9 by completing a square

The completing a square method requires: a^2\pm 2ab +b^2=(a\pm b)^2

Solving:

r^2-8r+9\\=(r)^2-2(r)(?)+(?)^2+9

We need to add and subtract (4)^2=16 to make the equation a complete square

=(r)^2-2(r)(4)+(4)^2-(4)^2+9\\=(r)^2-2(r)(4)+(4)^2-16+9\\=(r)^2-2(r)(4)+(4)^2-7\\=(r+4)^2-7

So, Solving  r^2-8r+9 by completing a square gives (r+4)^2-7

Keywords: Solve by completing a square

Learn more about Solve by completing a square at:

  • brainly.com/question/7932185
  • brainly.com/question/1414350
  • brainly.com/question/1464739

#learnwithBrainly

7 0
3 years ago
Mike bought 16 paperback books at the used book store for $10.95. Some cost $0.60 and some cost $0.75. How many of each did he b
serg [7]
X=number of books that cost 0.60
y=number of books that cost 0.75

x+y=16
0.6x+0.75y=10.95

solve
multiply second equation by 10 for nicity
6x+7.5y=109.5

multiply first equesiotn by -6 and add to second

-6x-6y=-96
<u>6x+7.5y=109.5 +</u>
0x+1.5y=13.5

1.5y=13.5
divide both sides by 1.5
y=9

sub back
x+y=16
x+9=16
minus 6
x=7

seven 0.60 books and nine 0.75 books
6 0
3 years ago
Ms santos seashells into 4 row she puts 6 seashells in each row how many seachells are there altogether
kati45 [8]
4 rows and 6 seashells in each row. 
Row 1: 0 0 0 0 0 0
Row 2: 0 0 0 0 0 0
Row 3: 0 0 0 0 0 0
Row 4: 0 0 0 0 0 0

You add all of them together 6+6+6+6=24 
Or you could do 6x4 and your answer would be 24
So the answer to the question is 24 seashells. 
3 0
3 years ago
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