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Ostrovityanka [42]
3 years ago
11

What is the sqare root of 81 pls help​

Mathematics
2 answers:
nexus9112 [7]3 years ago
5 0
It is 9

9*9=81
sqrt(81)=9
wlad13 [49]3 years ago
4 0

Answer:

Step-by-step explanation:

Is 9

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4/y+2 - 9/y-2 = 9/y^2-4
Evgesh-ka [11]
Going off the idea that this is 4/(y+2) - 9/(y-2) = 9/(y^2-4), let's first rewrite y^2-4 in the form of a^2-b^2, where a=y and b=2.
y/(y+2)-9/(y-2)=9/(y^2-2^2)
Now, use difference of squares: a^2-b^2=(a+b)(a-b)
4/(y+2)-9/(y-2)=9/((y+2)(y-2))
Multiply both sides by the Least Common Denominator: (y+2)(y-2)
4(y-2)-9(y+2)=9
Then keep on simplifying until you get your answer
-5y-26=9
-5y=9+26
-5y=35
y=35/-5
y=-7
Yay! Our answer is y=-7!
8 0
3 years ago
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In sunlight, a vertical yardstick casts a 1 ft shadow at the same time that a nearby tree casts a 15 ft shadow. How tall is the
kati45 [8]

Answer: A) 45 ft

Step-by-step

The yardstick is 3ft tall since 1 yard = 3ft. It is 3 times as tall as its shadow. The tree has a 15ft long shadow. The tree should also be 3 times as tall as its shadow. The tree is 15*3ft tall, so it is 45ft tall. I attached an image of the diagram I made.

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3 years ago
Which expression is equivalent to the given polynomial expression?
PilotLPTM [1.2K]

Answer:

-4 a^2 - 3 b

Step-by-step explanation:

8 0
3 years ago
A ruler is used to measure the width of the spine of a book.
sp2606 [1]

Answer:

1.00 cm Is the greatest level of precision possible for the measurement of the width of the spin of the book

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Radda [10]

Answer:

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Step-by-step explanation:

Half of 6 is 3

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