1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
irina1246 [14]
3 years ago
7

What is the radius for the circle given by the equation x^2+(y-3)^2=21

Mathematics
2 answers:
lina2011 [118]3 years ago
7 0

Answer:

4.583

Step-by-step explanation:

Equation of a circle is:

(x − h)² + (y − k)² = r²

where (h, k) is the center of the circle and r is the radius.

x² + (y − 3)² = 21

The center of the circle is (0, 3), and the radius is √21, or approximately 4.583.

s2008m [1.1K]3 years ago
5 0

x² + (y - 3)² = 21

We know the formula is (x - xo)² + (y - yo)² = r²

So, 21 is the radius²

21 = r²

r = √21

r = 4,58257

Rounding

r = 4,583

You might be interested in
I need to help my child do division but I don't know how to do it myself
Sedaia [141]
Well this is a hard question to answer, but this is how i would put it.

 You would take a number (lets use 15) and the second number (lets use 5) would determine how many times it would go into 15. In other words, 5 time x would equal 15 (5x=15). 5, being a factor of 15, would evenly fit into 15 three times.
8 0
2 years ago
Can someone plzzz help me with this math practice paper
weeeeeb [17]

Answer:

45 degrees for 8

135 degrees for 9

48 for 10

Yes a square is a rectangle

Next ones.

Sut = 21 becuase x=5

7

Step-by-step explanation:

Last one:

x^2 + 8 = 3x + 36

      - 8          -  8

x^2        = 3x + 28

     -3x       -3x

x^2 - 3x =     28

(x · x) - 3x = 28.        

This was were a little guess work was used,

I found that any number lower than 7 is less than 28 when pluged into x and any above is higher.

Hence x = 7

So

x^2 + 8 = 7^2 + 8

7 x 7 = 49.    49 + 8 = 57.

and

3x+36 = 7 x 3 + 36

7x3 = 21. 21 + 36 = 57.

Both lines are equal so x is indeed 7.

The RSTU rectangle

3x+6 = 5x-4

    +4        +4

3x+10 = 5x

-3x        -3x

10 = 2x

10/2 = 5

5 = x or x = 5

plug it in now

3 x 5 = 15. 15 + 6 = 21

and

5 x 5 = 25. 25 - 4 = 21

so x = 5

8-10

QRS = 45 degrees because bisects the square with a diagonal line from corner to corner

PTQ is a 135 degrees because it is wider than a 90 degrees angle and meets both upper corner from the middle of the square making it 135 degrees.

SQ = 48 because RT = 24 and RT is half the length of SQ meaning its length would be 48

Or

SQ= 24 degrees because RT = 24 and if RT was to continue on the line it is on it will reach the length of SQ.

3 0
3 years ago
I need help finding x!<br><br> Please show work for both!
Alenkinab [10]
1. Answer x=-5
You would subtract 25 from each side of the equal sign, taking 25 away from 40 and 25 away from 25, isolating the x. So you would then have -3x=15. You would then divide each side by -3, and getting x=-5
4 0
3 years ago
Read 2 more answers
What is the MAD of this data set?<br> 6,14,3,3,6,7,3
Alik [6]

Answer:3

Step-by-step explanation:

8 0
3 years ago
Find the measure of the indicated angle to the nearest degree
Alisiya [41]

Answer:

The answer to your question is below

Step-by-step explanation:

14) sin Ф = 32/33

    sin Ф = 0.9697

        Ф = 75.86°

15) sin Ф = 16/36

     sin Ф = 0.444

          Ф = 26.39°

16) sin Ф = 29/36

     sin Ф = 0.806

          Ф = 53.66°

17) cos Ф = 11/34

    cos Ф = 0.324

          Ф = 71.12°

18) sin Ф = 21/40

     sin Ф = 0.525

           Ф = 31.67°

19) cos Ф = 6/14

     cos Ф = 0.429

          Ф = 64.62°

20) cos Ф = 38/39

      cos Ф = 0.974

            Ф = 13°

3 0
3 years ago
Other questions:
  • Help, can’t figure it out, need help fast
    8·1 answer
  • Solve the following equation for X: 1/2(5x+12)=2x-3 show your work
    14·1 answer
  • The rough estimate of the perimeter of a rectangle of length 3.67 cm and width 2.54cm
    9·1 answer
  • Taking color into account, does the shape have rotational symmetry? If so, what is the angle of rotation, rounded to the nearest
    9·2 answers
  • A paper company needs to ship paper to a large printing business. The paper will be shipped in small boxes and large boxes. The
    6·1 answer
  • Which symbol correctly completes the statement?<br><br> -7 + 2 ___ 3 + (-9)<br><br><br> =
    7·1 answer
  • Plz do this, I’m so exhausted. Thxx
    12·2 answers
  • Mr. Smith checked on the pool when he expected it to be half full, but he found that it was only ​⅜​ full. He found a leak near
    9·2 answers
  • James bought a bag of onions that was labed 5 kilograms he needs to know how many grams that is for a recipe how many grams is 5
    11·1 answer
  • Find the equation of a line that contains the points (-8,0) and (-8, –6).
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!