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2 years ago

The radius of a circle is 6 kilometers. What is the circle's area?

Mathematics

1 answer:

Marysya12 [62]2 years ago

7 0

Answer:

113.04 km²

Step-by-step explanation:

Formula - Area = πr²

= 3.14 * 6²

= 113.04 km²

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A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 45 minutes. Supp

riadik2000 [5.3K]

Answer:

$H_0:\mu =45\\\\H_a:\mu\geq 45$

Step-by-step explanation:

Since we have given that

A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 45 minutes.

Since we need to carry out a hypothesis test whether he can refute the claim.

We always take the alternate hypothesis such that it should satisfy the given statement.

And the null hypothesis can be equal to mean or other than that is given in alternate hypothesis.

So, hypothesis :

$H_0:\mu =45\\\\H_a:\mu\geq 45$

5 0

2 years ago

Two owners of a cattle ranch, Jo and Val, want to find the average weight for the ranch's 200 cows. Instead of weighing all of t

Zolol [24]

Answer:

The value is $E =19.6$

Step-by-step explanation:

From the question we are told that

The mean of Jo cows is $\= x_1 = 1350$

The standard deviation of Jo cow is $s_1 = 50$

The mean of Val cows is $\= x_2 = 1420$

The standard deviation of Val cows is $s_2 = 50$

The sample size for both Val and Jo is n = 25

Let assume that the level of significance is $\alpha = 0.05$

Generally from the normal distribution table the critical value of $\frac{\alpha }{2}$ is

$Z_{\frac{\alpha }{2} } = 1.96$

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{\sigma }{\sqrt{n} }$

Hence margin of error for Jo is

=> $E = 1.96 * \frac{50}{\sqrt{25} }$

=> $E =19.6$

4 0

2 years ago

I Need help plz !!! just 2 questions Anyone !!!!

djverab [1.8K]

06.02 that he prediction is that he will land on heads and tails the same amount of times? Maybe that helped you some

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2 years ago

Read 2 more answers

Captain Liz is going to load her cruise ship with bags of sugar. She has room for 19 bags of sugar. She has allotted for 121 pou

Bad White [126]

: 1) If you were going to solve these, you would set them up like this. s+p=19 7s+10p=121 among the choices, b is the only one that is equivalent to one of these equations 2) The problem looks a little confusing. If the price is per box then they easily make $275. 8b+9h=53 20*8b+30*9h=275 If it's per batch, the answer is B. 3. x^2+y^2=16 y=x+4 solve the first equation for y y=√16-x^2 x+4=√16-x^2 (x+4)^2=16-x^2 x^2+8x+16=16-x^2 2x^2+8x=0 2x(x+4)=0 x=0 or x=-4 (be carefull i copyed and pasted the answer)

7 0

3 years ago

The set of all points is called: A) space B) plane C) line

jonny [76]

Answer:

the answer is space

Step-by-step explanation:

3 0

3 years ago