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3 years ago

PLEASE HELP ASAP! 20 POINTS BRAINLIEST IF RIGHT

Mathematics

2 answers:

Yanka [14]3 years ago

7 0

If im not mistaken
1 is columns
2 is columns
3 less
4 more
its been a long time so i could be wrong

Harman [31]3 years ago

3 0

Elements in the same Group have the same number of valence electrons.

Elements in the same Period have the same number of electron shells.

Metallic elements become Less reactive as you move left to right in a period.

Metallic elements become More reactive as you move top to bottom in a group.

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natita [175]

Answer:

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Step-by-step explanation:

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2 years ago

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3 years ago

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Alekssandra [29.7K]

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3 years ago

Read 2 more answers

How do you find DE, Round to nearest 10th

Sergeu [11.5K]

Answer: $DE\approx6.0$

Step-by-step explanation:

Observe in the figure given in the exercise that four right triangles are formed.

In this case you can use the following Trigonometric Identity to solve this exercise:

$cos\alpha=\frac{adjacent}{hypotenuse}$

From the figure you can identify that:

$\alpha =53\°\\\\hypotenuse=10\\\\adjacent=BE=DE$

Then, you can substitute values:

$cos(53\°)=\frac{DE}{10}$

The next step is to solve for DE in order to find its value. This is:

$10*cos(53\°)=DE\\\\DE=6.01$

Finally, rounding the result to the nearest tenth, you get that this is:

$DE\approx6.0$

7 0

3 years ago