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
10 inches equals how many millimeters?
solong [7]
1 in equals 25.4 mm 

so in this case you multiply 25.4 times 10

to get 254
4 0
3 years ago
Read 2 more answers
A kilometre is about 5/8 mile. How many kilometres are in 2 3/4 miles?
Lapatulllka [165]

Answer:

To do this in my head: 60km = 40km+20km

So 40km/8km = 5

40 k is approximately 5x5miles = 25 miles

20k is half that or 12.5 miles

60 is about 25+12.5 miles

or 37.5 miles

4 0
2 years ago
Answer plssssssssssss
nadezda [96]
It’s not A or C. I think it’s D because of its positive slopes. If you have a graphing calculator, you can type this into y=
6 0
1 year ago
A simple random sample of size n = 49 is obtained from a population with u = 89 and o = 21.
Furkat [3]

Answer:

a) B. The distribution is approximately normal.

b) 0.0322 = 3.22%

c) 0.0202 = 2.02%

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

In a set with mean  and standard deviation , the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Mean and standard deviation:

\mu = 89, \sigma = 21

Sample of 49:

This means that n = 49, s = \frac{21}{\sqrt{49}} = 3

(a) Describe the sampling distribution of x.

By the Central Limit Theorem, approximately normal, and the correct answer is given by option B.

(b) What is P (x > 94.55) ?

This is 1 subtracted by the p-value of Z when X = 94.55, so:

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{94.55 - 89}{3}

Z = 1.85

Z = 1.85 has a p-value of 0.9678.

1 - 0.9678 = 0.0322

So 0.0322 = 3.22%

Question c:

This is the p-value of Z when X = 82.85. So

Z = \frac{X - \mu}{s}

Z = \frac{82.85 - 89}{3}

Z = -2.05

Z = -2.05 has a p-value of 0.0202.

So

0.0202 = 2.02%

7 0
3 years ago
What is the slope of the line that passes through the points (-4, -3) and(14,0)? Write your answer in simplest form.
12345 [234]

Answer:

1/6

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • Please help me on number 11-12! <br><br><br><br> Thank you! :)
    5·1 answer
  • Find the measure of ∠2.<br><br> and how did you find the answer??
    5·1 answer
  • In triangle ABC angle BAD is 46° find BCA and AB=AD=AC
    15·1 answer
  • Chinedu sat down to do his homework, which included 30 math problems. He solved 2 problems each minute. Let f(n) be the number o
    11·1 answer
  • What is the missing numbers<br><br> 9 tenths + 7 hundredths<br><br> 6 tenths + _ hundredths = 0.66
    14·2 answers
  • What is the measurement of angle a?
    15·1 answer
  • The diameter of Circle Q terminates on the circumference of the circle at (3,0) and (3,-7) . Write the equation of the circle in
    6·1 answer
  • Using the slope formula for the point (1,5) and (2,-2),what would the denominator?
    6·2 answers
  • Simplify the expression below as much as possible.<br> (8 + 5i) + (10 +6i) - (3 +61)
    14·1 answer
  • 14/126 in simplest terms
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!