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2 years ago

Rationalise 1/√7-√3PLEASE GIVE ANSWER IT'S URGENT

1 answer:

5 0

$\dfrac 1{\sqrt 7- \sqrt 3}\\\\\\=\dfrac{\sqrt 7 + \sqrt 3}{\left ( \sqrt 7 -\sqrt 3\right) \left( \sqrt 7 + \sqrt 3\right)}\\\\\\=\dfrac{\sqrt 7 + \sqrt 3}{\left(\sqrt 7 \right)^2 - \left(\sqrt 3 \right)^2}\\ \\\\=\dfrac{\sqrt 7 + \sqrt 3}{7-3}\\\\\\=\dfrac 14\left(\sqrt 7 + \sqrt 3\right)$

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Please Help! I'm stuck!

atroni [7]

Answer:

See attached image

Step-by-step explanation:

If you have two marbles in a bag and you are choosing the marbles randomly twice, then we can look at fractions.

Each time, you have a 0.5 chance of picking the silver marble. After you pick that, you have another 0.5 chance of picking the silver marble again.

This applies with any combination.

This means that the probability of you getting two silvers in a row is 0.25.

Since the marbles are the same size and nothing is stopping you from choosing one, this probability applies to all combinations possible.

Hope this helped!

8 0

3 years ago

What is the perimiter, in feet, of a square whose area is 121 square feet

Ainat [17]

Square needs to have all equal sides and length and width are the same.

So sqrt the area.

sqrt 121 = 11

11 feet is the length of one side, square has 4.

11 * 4 = 44

The perimeter of a square (whose area is 121 feet) is 44 feet.

5 0

3 years ago

A card is drawn at random from a standard pack of playing cards.

Hatshy [7]

Answer:

the chance at getting 9 is 17% and then 50% for the coin

Step-by-step explanation:

5 0

3 years ago

R−5r−6s+8s−15 what is the answer for this equation

weeeeeb [17]

Step-by-step explanation:

r-5r-6s+8s-15

-4r+2s-15

= 2s-4r-15

4 0

3 years ago

Find the solution set

AVprozaik [17]

M1= -5 , m2 = 5 inorder to get this you move the constant to the right take the root of both sides separate the solutions and you should get m1= -5, m2 =5

7 0

3 years ago

Rationalise 1/√7-√3PLEASE GIVE ANSWER IT'S URGENT ​

Rationalise 1/√7-√3PLEASE GIVE ANSWER IT'S URGENT