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3 years ago

(ASAP) i need help plsssssszzz

Mathematics

2 answers:

arsen [322]3 years ago

8 0

Answer:

the first one is right....

pickupchik [31]3 years ago

7 0

It’s The first anwser

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the radius of the aluminum atom is 143pm. the radius of the aluminum atom is 54pm. by what percentage did the radius change as t

Dennis_Churaev [7]

Answer:

There was 62.23% change in radius as the ion formed.

Step-by-step explanation:

Given

Radius of Aluminium $(Al)$ atom = 143 pm

Radius of Aluminium $(Al^{3+})$ atom = 54 pm

Change is the radius = Radius of Aluminium $(Al)$ atom - Radius of Aluminium $(Al^{3+})$ atom = 143 -54 = 89

Now to find % Change is the radius we will divide Change is the radius by Radius of Aluminium $(Al)$ atom and multiply by 100 we get

% Change is the radius = $\frac{\textrm{Change is the radius}}{\textrm{Radius of Aluminium (Al) atom}} \times 100 = \frac{89}{143}\times100= 62.23\%$

Hence there was 62.23% change in radius as the ion formed.

4 0

4 years ago

A wire is attached from the top of a 30 foot telephone pole to a stake in the ground. If the angle formed by the wire and the po

sergejj [24]

Answer:

12ft

Step-by-step explanation:

i think it is right

8 0

3 years ago

When Nancy started middle school she was 60 inches tall.when she started high school ,she was 66 inches tall.what was the percen

Ahat [919]

10%
You can do this in your head easily, but here is an equation.
x is the starting number, v is the number that changed and p is the percent.
x / v = p

4 0

4 years ago

A boat is 400 feet away from one dock and 500 feet away from the another dock. the angle between the paths is 45°. what is the a

FinnZ [79.3K]

Answer:

The approximate distance between the docks is 357 feet

Step-by-step explanation:

Let the distance between docks be d.

This is the opposite side to 45° angle of triangle with other sides 400 ft and 500 ft.

Use the law of cosines to find the value of d:

$d = \sqrt{400^2+500^2-2*400*500*cos45} =357$ (rounded)

8 0

2 years ago

What is the probability that a randomly selected person is on the swim team? Express the probability as a percent rounded to the

frez [133]

<span>What is the probability that a randomly selected person is on the swim team?
28 out of 67 people are on the swim team
so that's 28/67
</span><span>41.7910448% round to the nearest tenth
41.8% is the answer.

Hope this helps, Have a nice day!</span>

5 0

3 years ago