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3 years ago

6

Find the volume of the sphere

1 answer:

madam [21]3 years ago

6 0

Answer:

sphere volume = 3052.1 in³

Step-by-step explanation:

sphere volume = 4/3πr³ = 4/3(3.14)(9³) = 3052.1 in³

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Which point represents the vertex of the marked angle?

xxTIMURxx [149]

The correct answer for the question that is being presented above is this one: "Point E." The p<span>oint that represents the vertex of the marked angle is the point E.
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Here is the link of the image: http://assets.openstudy.com/updates/attachments/547f6445e4b03e22bc88fa0f-16cepps-1417634973773-math......

3 0

4 years ago

Most dermatologists recommend using sunscreens that have a Sun Protection Factor (SPF) of at least 30. One of the authors wanted

Basile [38]

Answer: We are 95% confident that the mean SPF level of sunscreen used by all Cal Poly students is between 29.0813 and 40.0187.

Step-by-step explanation:

Given : Significance level : $\alpha: 1-0.95=0.05$

Sample size : n= 52 , which is a large sample (n>30), so we use z-test.

By using z-value table,

Critical value: $z_{\alpha/2}=1.96$

Sample mean : $\overline{x}= 34.55$

Standard deviation : $\sigma= 20.12$

The confidence interval for population means is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

i.e. $34.55\pm(1.96)\dfrac{ 20.12}{\sqrt{52}}$

$=34.55\pm5.46867829455\\\\\approx34.55\pm5.4687\\\\=(34.55-5.4687, 34.55+5.4687)=(29.0813,\ 40.0187)$

Now, the 95% confidence interval for the ppopulation mean = . (29.0813, 40.0187)

Hence, We are 95% confident that the mean SPF level of sunscreen used by all Cal Poly students is between 29.0813 and 40.0187.

7 0

3 years ago

Greg is recording the changes in his bank account balance. In the morning, he records a deposit of $7. In the afternoon, he reco

mel-nik [20]

Answer:

Step-by-step explanation:

i think that it is either -7 - -8 or -7 + 8 or -7+-8.

4 0

2 years ago

Help me answer this one answer

qwelly [4]

The standard formula for the circumference (C) of a circle in terms of its diameter (d) is ...

... C = π·d

6 0

3 years ago

Rozlyn invested $2000 in an account that pays 4.25% annual simple interest. She will not make any additional deposits or withdra

PilotLPTM [1.2K]

Answer:

$850

Step-by-step explanation:

Interest = Principal x Rate x Time

I = 2000(.0425)(10)

I = 850

3 0

3 years ago