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3 years ago

What is the radius of 20? (20 is the diameter)

2 answers:

7 0

A radius is half of the diameter. So if the diameter is 20, the radius would be 10.
I hope this helps!
Feel free to ask any questions!

Goshia [24]3 years ago

4 0

Well if d= 20
d=2r

so 20 = 2r

r=10

is that what you wanted, or does this have to do with a circle

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What is the equation of a line that passes through (-6,2) and has a slope of ‘-(1)/(2)’?

alexandr1967 [171]

Answer:

y= $-\frac{1}{2}$ x -1

Step-by-step explanation:

y=mx+c

y= $-\frac{1}{2}$ x +c

substitute (-6;2)

2= $-\frac{1}{2}$ (-6)+c

2=3+c

2-3=c

c=-1

8 0

3 years ago

\Which expression is equivalent to Negative 2 and one-fourth divided by negative two-thirds?

eduard

Answer:

See below

Step-by-step explanation:

Not sure which answer it is because it did not translate well

(2 1/4 ) / (-2/3) = (9/4) / ( -2/3) = 9/4 * (-3/2) = -27/8 <====maybe your answer is in there somewhere?

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2 years ago

Suppose you just received a shipment of twelve televisions. Three of the televisions are defective. If two televisions are rando

qwelly [4]

Answer: The probability that both televisions work is 0.5625 .

The probability at least one of the two televisions does not work is 0.4375.

Step-by-step explanation:

Given : Number of televisions received in shipment= 12

Number of defective televisions received in shipment= 3

Then proportion of defective televisions = $\dfrac{3}{12}=0.25$

Using binomial probability formula, the probability of getting success in x trials is given by :-

$P(x)=^nC_xp^x(1-p)^{n-x}$

If two televisions are randomly selected, then the probability that both televisions work will be :-

$P(0)=^2C_0(0.25)^0(0.75)^2=(0.75)^2=0.5625$

The probability at least one of the two televisions does not work will be :-

$P(x\geq1)=1-P(0)=1-0.5625=0.4375$

6 0

2 years ago

The value of a collector’s item is expected to increase exponentially each year. The item is purchased for $500 and its value in

vekshin1

The item value after 4 years is $607.75 and could you put me as brainliest?

8 0

3 years ago

Read 2 more answers

An environmental scientist wants to use a 95% confidence interval to estimate the mean number of hours per day her solar panel r

MissTica

Answer:

a) The 95% confidence interval for the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

b) The confidence interval is built from a sample of 48 days. However, we can be 95% sure that for all days, the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

Step-by-step explanation:

We have the standard deviation for the sample. So we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 48 - 1 = 47

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 47 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.95}{2} = 0.975$ . So we have T = 2.0117

The margin of error is:

M = T*s = 2.0117*2.3 = 4.6

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 7.1 - 4.6 = 2.5 hours of sunlight per day

The upper end of the interval is the sample mean added to M. So it is 7.1 + 4.6 = 11.7 hours of sunlight per day

a) Compute the 95% confidence interval for the mean.

The 95% confidence interval for the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

b) Explain your confidence interval from part (a) in context.

The confidence interval is built from a sample of 48 days. However, we can be 95% sure that for all days, the mean number of hours per day her solar panel receives direct sunlight is between 2.5 and 11.7.

6 0

3 years ago