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sladkih [1.3K]
3 years ago
11

Go

Mathematics
1 answer:
maksim [4K]3 years ago
8 0

Answer:

two of the sides are 21 m long and one of the sides is 28 m long

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How do i solve this?
alina1380 [7]

Answer:

x=3

Step-by-step explanation:

minus 3x on both sides

after you've subtracted 3x from both sides you then need to minus 12 from both sides

Last step is going to be dividing by 2 and you should get the answer of 3

8 0
3 years ago
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For the reaction 2Fe + O2 → 2FeO, how many grams of iron oxide are produced from 42.4 mol of iron?
Butoxors [25]

In the balanced reaction

2 Fe + O₂   →   2 FeO

2 moles of iron (Fe) react with 1 mole of molecular oxygen (O₂) to produce 2 moles of iron oxide (FeO). The ratio of Fe to FeO is 1-to-1, so if one starts with 42.4 mol of Fe, one will end up with the same amount of FeO, 42.4 mol.

Look up the molar mass of Fe and O:

• Fe = 55.845 g/mol

• O = 15.999 g/mol

Then the molar mass of FeO is approximately 71.835 g/mol, and so the mass of 42.4 mol of FeO is

(42.4 mol) × (71.835 g/mol) ≈ 3050 g

8 0
2 years ago
Please please help me with this and say the answer please asap
lesya692 [45]

Answer:

C, 7 times 7 = 49

7 times 4= 28

7 0
3 years ago
Which triangle’s unknown side length measures 7 units?
kow [346]

A (A right triangle with a side length of 5 and hypotenuse with length \sqrt{74})

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Which of these is the standard form of the following function?
Step2247 [10]
I’m pretty sure the answer would be B
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3 years ago
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