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
pogonyaev
3 years ago
9

What is the radius of a circle whose equation is x2 + y2 – 10x + 6y + 18 = 0?

Mathematics
2 answers:
antoniya [11.8K]3 years ago
5 0
You can do this by completing the square on x and y terms:

  x^ - 10x + y^2 + 6y + 18 = 0

  (x - 5)^2 -25 + (y + 3)^2 - 9 + 18 = 0

  (x - 5)^2  + (y + 3)^2 = -18 + 9 + 25  =  16


so radius = sqrt16  = 4 answer
chubhunter [2.5K]3 years ago
5 0

Answer:

radius = 4

Step-by-step explanation:

the radius of a circle whose equation is x^2 + y^2 - 10x + 6y + 18 = 0

write the equation in center radius form

(x-h)^2+(y-k)^2= r^2

Use completing the square method, take the coefficient of x  and y . then divide it by 2 and then square it. Add it on both sides

x^2- 10x+ y^2 + 6y + 18 = 0

(x^2- 10x+25)+ (y^2 + 6y+9) + 18 = 25+9

(x-5)^2+ (y+3)^2 + 18 = 25+9

Subtract 18 on both sides

(x-5)^2+ (y+3)^2=16

radius r^2=16

Take square root on both sides

radius r= 4

You might be interested in
Ab with slope = 5 and ST with slope = 5
9966 [12]

Answer:

Parallel

Step-by-step explanation:

ffhuyghhtgh

5 0
2 years ago
Jericho is doing a quick survey for his high school newspaper. He hands out a simple index card to 100 seniors in his high schoo
Kazeer [188]

Answer:

50

Step-by-step explanation:

From research among high school students in the US, it was discovered in 2017 by US Centre for Disease Control and Prevention Agency(USCDC), that around 57.8% of high school students have drank alcohol in the previous 1 year.

Now, applying it to this question, since the survey is done among 100 seniors, the most modest probability would likely be 50% which represents 50 people out of the 100 surveyed that will likely check yes

8 0
2 years ago
Y equals negative X squared +10 X -26
Pani-rosa [81]

Answer:

Step-by-step explanation:

y=(x+5)2−1

Use the vertex form,

y=a(x−h)2+k, to determine the values of a, h, and .a=1h=−5k=−1Find the vertex(h,k(−5,−1)

3 0
3 years ago
What is the equation in point slope form of the line that passes through the point (2,6) and has slope of 5?
sleet_krkn [62]
Firstly, you can use the slope and the first point to find a second point:
2 + 1 = x2 and 6 + 5 = y2 because the slope is 5/1. 
Next you can write the equation in point-slope form (remember point-slope form is y - y1 = m(x - x1):
y - 11 = 5(x - 3) 
Another equation would be B because B is the correct equation if you choose 2 as x2 and 6 as y2. 
Hope this helps!

5 0
3 years ago
Read 2 more answers
Please help me with 168÷45​
velikii [3]

Answer:

3.73 ( The three is infinite)

Step-by-step explanation:

7 0
2 years ago
Other questions:
  • Algebra2 <br>|2-3(2w+1)=7w-3(7+w)
    14·1 answer
  • Rationalize the denominator of the fraction and enter the new denominator below.<br><br>8/2-√12
    7·2 answers
  • ABCO is the image of ABCD What transformation(s) would result in this image?
    11·1 answer
  • 5(a+6)<br>I need the answer​
    7·2 answers
  • The graph of which of the following inequalities has open circles on -8 and 2 with a line segment between them?
    15·1 answer
  • List the common factors of the numbers 9 and 18
    6·1 answer
  • Sarabeth used a box-and-whisker plot to summarize her race times in minutes. She didn't include her latest race time of 28 minut
    12·1 answer
  • Rewrite the following equation in exponential
    7·1 answer
  • T=2r + 3<br> 5r - 4t = 6
    14·2 answers
  • 8.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!