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
Bogdan [553]
3 years ago
5

What is the radius of the circle given by the equation x^2+y^2=49?

Mathematics
2 answers:
viktelen [127]3 years ago
8 0

The answer is "C. 7."


The equation of a circle is (x-h)²+(y-k)²=r². r² represents the radius squared, or multiplied by itself. 7 multiplied by 7 is equal to 49, so the radius of the circle would be 7.

Marta_Voda [28]3 years ago
7 0

Formula of the circle


(x-a)² +(y-b)² = r²,


where r is a radius, (a,b) - coordinates of the center.

So,

x² + y² = 49

(x-0)² + (y-0)² = 49.

Center  of this circle has coordinates (0,0).

x² + y² = 7²

r = 7


Answer is C.7.

You might be interested in
A theory predicts that the mean age of stars within a particular type of star cluster is 3.3 billion years, with a standard devi
Luden [163]

Answer:

Null hypothesis:\mu \leq 3.3  

Alternative hypothesis:\mu > 3.3  

z=\frac{3.4-3.3}{\frac{0.4}{\sqrt{50}}}=1.768  

Since is a one right tailed test the p value would be:  

p_v =P(z>1.768)=0.039  

Step-by-step explanation:

Data given and notation

\bar X=3.4 represent the sample mean  

\sigma=0.4 represent the population deviation for the sample

n=50 sample size  

\mu_o =3.3 represent the value that we want to test  

\alpha represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses to be tested  

We need to conduct a hypothesis in order to determine if the mean is higher than 3.3, the system of hypothesis would be:  

Null hypothesis:\mu \leq 3.3  

Alternative hypothesis:\mu > 3.3  

Compute the test statistic  

We know the population deviation, so for this case is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

We can replace in formula (1) the info given like this:  

z=\frac{3.4-3.3}{\frac{0.4}{\sqrt{50}}}=1.768  

P value

Since is a one right tailed test the p value would be:  

p_v =P(z>1.768)=0.039  

6 0
3 years ago
What is the main idea of this passage from the
ella [17]

Answer: B. The United States might not have been able to stop the attacks, but it could have made a better effort to do so.

Step-by-step explanation:

6 0
3 years ago
A) y = 5x
notsponge [240]

Answer:

if x doubles y will be 2y &if x triples the value will be 3y

6 0
3 years ago
Which expression is equivalent to -32 3/5
RSB [31]

Answer:

See below.

Step-by-step explanation:

-32 3/5

= [(-32* 5) + 3] / 5

= -163/5 is one expression.

Another is -32.6 ( because 3/5 = 0.6).

8 0
3 years ago
Read 2 more answers
What is the greatest common factor of 48 and 168
snow_lady [41]

Answer:

24

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Other questions:
  • Please help!! In all honesty, I am absolutely terrible at math. Sometimes I get it, but most of the time I'm brain dead.
    6·1 answer
  • Type the correct answer in the box
    5·1 answer
  • What is the unit rate for 4543.08 km in 52.4 h? Enter your answer, as a decimal, in the box. km/h
    11·2 answers
  • PLZ HELP AND EXPLAIN !! Arron borrowed $200 from his cousin. He promised to repay the loan in 2 years at a simple annual interes
    11·1 answer
  • 2+2+374+820+829-9204
    7·2 answers
  • Solve for x: 3(x + 1) = -2(x - 1) - 4
    8·1 answer
  • There are 2 red pens, 3 blue pens, 1 black pen, and 4 green pens in a desk drawer. You randomly choose one. Find each probabilit
    15·1 answer
  • 14 less than 8 times 8 number is 3 more than four times the number what is the answer​
    5·1 answer
  • ON THIS YOU HAVE TO GRAHP EACH NUMBER INTO A NUMBERLINE
    7·2 answers
  • Write an equation of the line passing through
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!