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2 years ago

What is the equation of the circle with center (-3.2,2.1) and radius 4.3?

Mathematics

2 answers:

Nutka1998 [239]2 years ago

8 0

$(x+3.2)^2+(y-2.1)^2=4.3^2$

marissa [1.9K]2 years ago

8 0

Answer:

$(x+3.2)^2+(y-2.1)^2=(4.3)^2$

Step-by-step explanation:

It is given that the center of the circle is (-3.2,2.1) and radius is 4.3.

Now, the equation of the circle with center (a,b) and the radius 'r' is represented as:

$(x-a)^2+(y-b)^2=r^2$

Now, the given center is (-3.2,2.1) and radius is 4.3, thus the equation of the circle becomes,:

$(x-(-3.2))^2+(y-2.1)^2=(4.3)^2$

$(x+3.2)^2+(y-2.1)^2=(4.3)^2$

Which is the required equation.

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Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. Th

Verizon [17]

Answer:

$(21.9-19.8) -1.966\sqrt{\frac{3.4^2}{200} +\frac{3.5^2}{200}}= 1.422$

$(21.9-19.8) -1.966 \sqrt{\frac{3.4^2}{200} +\frac{3.5^2}{200}}= 2.778$

And we are 95% confident that the true difference means are between $1.422 \leq \mu_1 -\mu_2 \leq 2.778$

Step-by-step explanation:

We know the following info:

$\bar X_1 = 21.9$ sample mean for group 1

$\bar X_2 = 19.8$ sample mean for group 2

$s_1 = 3.4$ sample standard deviation for group 1

$s_2 = 3.5$ sample standard deviation for group 2

$n_1 = 200$ sample size group 1

$n_2 = 200$ sample size group 2

We want to find a confidence interval for the difference of means and the correct formula to do this is:

$(\bar X_1 -\bar X_2) \pm t_{\alpha/2} \sqrt{\frac{s^2_1}{n_1} +\frac{s^2_2}{n_2}}$

Now we just need to find the critical value. The confidence level is 0.95 then the significance is $1-0.95 =0.05$ and $\alpha/2 =0.025$ . The degrees of freedom are given by:

$df= n_1 +n_2 -2= 200+200-2= 398$

The critical value for this case would be : $t_{\alpha/2}=1.966$

And replacing into the confidence interval formula we got:

$(21.9-19.8) -1.966\sqrt{\frac{3.4^2}{200} +\frac{3.5^2}{200}}= 1.422$

$(21.9-19.8) -1.966 \sqrt{\frac{3.4^2}{200} +\frac{3.5^2}{200}}= 2.778$

And we are 95% confident that the true difference means are between $1.422 \leq \mu_1 -\mu_2 \leq 2.778$

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3 years ago

the cost c in dollars for the care and maintenance of a horse and carriage is c= 15x+2000, where x is the number of rides. they

olga nikolaevna [1]

Cost = 15x + 2000
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At break even, cost = earning

35x = 15x + 2000
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x = 100

100 rides are needed to break even.

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The outdoor temperature increases by 3 degrees each hour for 4 hours.

Thepotemich [5.8K]

Answer:

Step-by-step explanation:

4hoursx3 temp increase=12

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2 years ago

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ikadub [295]

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