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Papessa [141]
3 years ago
5

Simplify the expression \[\frac{6}{\sqrt{36} + \sqrt{27}} + \frac{6}{\sqrt{27} + \sqrt{18}} + \frac{6}{\sqrt{18} + \sqrt{9}}.\]

Mathematics
1 answer:
Viktor [21]3 years ago
7 0

Answer:

= 18 ( 3 + 2(\sqrt{3}  + \sqrt{2} ))

Step-by-step explanation:

6(\sqrt{36} +\sqrt{27}) + 6(\sqrt{27} +\sqrt{18}) + 6(\sqrt{18} + \sqrt{9} )\\= 6( {6} +\sqrt{9*3}) + 6( \sqrt{9*3}  +\sqrt{9*2}) + 6(\sqrt{9*2} + 3 )\\= 6( {6} +3\sqrt{3}) + 6(3\sqrt{3} +3\sqrt{2}) + 6(3\sqrt{2} + 3 )\\=36 + 18\sqrt{3} + 18\sqrt{3} + 18\sqrt{2}+ 18\sqrt{2} + 18\\= 36+18  +18( \sqrt{3}+ \sqrt{3} +\sqrt{2} + \sqrt{2})\\= 54 + 18 (2\sqrt{3} +2\sqrt{2})\\=54 + 36\sqrt{3}  + 36\sqrt{2}\\= 18 ( 3 + 2(\sqrt{3}  + \sqrt{2} ))

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vagabundo [1.1K]

Answer:

7.5

Step-by-step explanation:

8 0
3 years ago
A retailer ordered a combination of 50 black and white sweatshirts. Each white sweatshirt cost him $10 and
Brut [27]

The number of white  sweatshirts is 28

Step-by-step explanation:

Let ordered black shirts be represented by b

Let ordered white shirts be represented by w

So total sweatshirts will be represented by the equation

b+w=50

The total cost of the ordered sweatshirts will be represented by

10b + 12 w= $556

For simultaneous equations as;

b+w=50

10b+12w=556

solving the equations using substitution method where b=50-w

10(50-w)+12w=556

500-10w+12w=556

-10w+12w=556-500

2w=56

w=56/2= 28

b=50-w=50-28=24

Number of white  sweatshirts  is 28

Learn More

Simultaneous equation :brainly.com/question/12919422

Keyword : cost

#LearnwithBrainly

4 0
3 years ago
How do U solve this?​
Sonbull [250]
See photo for solution and mark me as brainliest if you think i helped!

4 0
3 years ago
Read 2 more answers
Please help me, due soon ​
Lady_Fox [76]

Answer:

  • A robot can complete 1 task in 5/48 hours.
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6 0
3 years ago
Read 2 more answers
PLEASE HELP!!! I don't understand it
Len [333]

Answer:

A

Step-by-step explanation:

This is exponential decay; the height of the ball is decreasing exponentially with each successive drop.  It's not going down at a steady rate.  If it was, this would be linear.  But gravity doesn't work on things that way.  If the ball was thrown up into the air, it would be parabolic; if the ball is dropped, the bounces are exponentially dropping in height.  The form of this equation is

y=a(b)^x, or in our case:

A(n)=a(b)^{n-1}, where

a is the initial height of the ball and

b is the decimal amount the bounce decreases each time.  For us:

a = 1.5 and

b = .74

Filling in,

A(n)=1.5(.74)^{n-1}

If ww want the height of the 6th bounce, n = 6.  Filling that into the equation we already wrote for our model:

A(6)=1.5(.74)^{6-1} which of course simplifies to

A(6)=1.5(.74)^5 which simplifies to

A(6)=1.5(.22190066)

So the height of the ball is that product.

A(6) = .33 cm

A is your answer

3 0
3 years ago
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