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Semmy [17]
3 years ago
8

What is the principal or(postive)square root of a number N

Mathematics
1 answer:
Margaret [11]3 years ago
7 0
The square root of number n is a number, r, that when squared equals n.
Each positive number has two square roots, a positive one and a negative one. The principal square root of a positive number is the positive square root.

For example, this of n = 4.
There are two numbers, r, that when squared equal 4.
The are 2 and -2, since 2^2 = 4 and (-2)^2 = 4.
4 has two square roots, a positive one and a negative one.
The positive square root, 2, is the principal square root of 4.

The symbol for the principal square root is the square root symbol.

\sqrt{4}

means the principal square root of 4, which is 2.

If you mean the negative square root of 4, which is -2, then you must write a negative sign before the square root symbol.

-\sqrt{4}

means the negative square root of 4 which is -2.

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Solve the problem. For large numbers of degrees of​ freedom, the critical chi χ squared 2 values can be approximated using the f
kykrilka [37]

Answer:

0.01  =0.0001

Step-by-step explanation:

7 0
3 years ago
Find the exact value of Cos 240 degrees without a calculator. Show your work!
VMariaS [17]

it equals <span>(−<span>12</span>)</span> because <span><span>cos<span>(<span>60∘</span>)</span></span>=<span>12</span></span>

Explanation:

The reference angle for <span>240∘</span> is <span>60∘</span> (since <span><span>240∘</span>=<span>180∘</span>+<span>60∘</span></span>)

<span>60∘</span> is an angle of one of the standard triangles with 
<span><span>cos<span>(<span>60∘</span>)</span></span>=<span>12</span></span>

<span>240∘</span> is in the 3rd quadrant so (either by CAST or noting that the "x-side" of the associate triangle is negative)
<span><span>cos<span>(<span>240∘</span>)</span></span>=−<span>cos<span>(<span>60∘</span>)</span></span></span>

<span><span>cos<span>(<span>240∘</span>)</span></span>=−<span><span>12</span></span></span>

6 0
3 years ago
One tank is filling at a rate of 4/5 gallon per 1/2 minute. A second tank is filling at a rate of 7/8 gallon per 1/2 minute. Whi
telo118 [61]

Answer:

The second tank.

Step-by-step explanation:

Since both filling up at the same rate, all you would have to do is multiply the gallons.

4/5 multiplying top and bottom by 8 is 32/40

7/8 multiplying top and bottom by 5 is 35/40

8 0
3 years ago
Read 2 more answers
Please give me the answer to this problem
Darya [45]

Total 27inch^

Calculation of 1 rectangle +1 triangle(11-7=4 is the base)

triangle    x^+4^=5^

                  x^+16=25

                  x^=9

                    x=3      (height=3)

Sides of triangle  Base=4   Hypotenuse=5     height =3 

area 1/2 4  x  3  =2x3=6

Area triangle =6

Area Rectanglel   7x3=21

21+6=27 inch^ total area



5 0
3 years ago
Please help hurryyyyyyy
zysi [14]

Answer:

Hey there!

40 is 25% of 120.

We can see that 30 is 25% of 120, because 0.25(120)=30.

Hope this helps :)

4 0
3 years ago
Read 2 more answers
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