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3 years ago

8

A class goes to a science museum. There is an exhibit which has a giant sphere that shows different weather patterns. The surfac

e area of the sphere is 24,316.16 ft. What is the radius of the sphere? Use 3.14 for pi.

1 answer:

skelet666 [1.2K]3 years ago

4 0

Answer: sjsjsjdjffj

Step-by-step explanation:

You might be interested in

If 30% of a bag of Skittles is 12 pieces, how

Salsk061 [2.6K]

Answer:

40

Step-by-step explanation:

12 is 30% of 40

30% x X = 12 or 30/100 x = 12

so if you multiply both sides by 100 and divide both sides by 30

we get X = 12 x 100/30

= 40

(BTW if you want to use a calculator just put 12×100÷30 which will give you the answer)

3 0

2 years ago

I need help on this question

Pie

Answer:

(f-g)(4) = 10

Step-by-step explanation:

(f-g)(x) = f(x) - g(x)

= 1/2 x^2 - 1/4 x + 4 - 1/2 x + 1

= 1/2 x^2 - 1/4 x - 1/2 x + 4 + 1

= 1/2 x^2 - 3/4 x + 5

(f-g)(4)

= 1/2 (4)^2 - 3/4 (4) + 5

= 1/2 * 16 - 3 + 5

= 8 - 3 + 5

= 5 + 5

= 10

4 0

2 years ago

gladu [14]

Since the balloon is at h height and has a change of 5 ft that means it could go up (+5) or down (-5) ft. So the answer would be c and D

h+5 and h-5

5 0

3 years ago

The operations manager of a manufacturer of television remote controls wants to determine which batteries last the longest in hi

Margarita [4]

Answer:

$t=\frac{107.75-116.75}{\sqrt{\frac{2.75^2}{4}+\frac{9.604^2}{4}}}}=-1.802$

The degrees of freedom are given by:

$df=n_{1}+n_{2}-2=4+4-2=6$

The p value for this case would be given by:

$p_v =2*P(t_{(6)}$

Since the p value is higher than the significance level we have enough evidence to FAIl to reject the null hypothesis and we can conclude that the true mean is not significantly different between the two types of battery

Step-by-step explanation:

Information given

Battery 1 106 111 109 105

Battery 2 125 103 121 118

We can calculate the mean and the deviation with the following formulas"

$\bar X =\frac{\sum_{i=1}^n X_i}{n}$

$s =\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

$\bar X_{1}=107.75$ represent the mean for the Battery 1

$\bar X_{2}=116.75$ represent the mean for the Bettery 2

$s_{1}=2.75$ represent the sample standard deviation for the Battery 1

$s_{2}=9.604$ represent the sample standard deviation for the battery 2

$n_{1}=4$ sample size selected for the Battery 1

$n_{2}=4$ sample size selected for the Battery 2

$\alpha=0.1$ represent the significance level

t would represent the statistic

$p_v$ represent the p value

System of hypothesis

We want to check if the difference in longevity between the two batteries, the system of hypothesis would be:

Null hypothesis: $\mu_{1} = \mu_{2}$

Alternative hypothesis: $\mu_{1} \neq \mu_{2}$

The statistic is given by:

$t=\frac{\bar X_{s1}-\bar X_{2}}{\sqrt{\frac{s^2_{1}}{n_{1}}+\frac{s^2_{2}}{n_{2}}}}$ (1)

The statistic is given by:

$t=\frac{107.75-116.75}{\sqrt{\frac{2.75^2}{4}+\frac{9.604^2}{4}}}}=-1.802$

The degrees of freedom are given by:

$df=n_{1}+n_{2}-2=4+4-2=6$

The p value for this case would be given by:

$p_v =2*P(t_{(6)}$

Since the p value is higher than the significance level we have enough evidence to FAIl to reject the null hypothesis and we can conclude that the true mean is not significantly different between the two types of battery

8 0

2 years ago

I need help ASAP! Pease help me understand this

daser333 [38]

Answer:

25 meters

Step-by-step explanation:

Imagine a segment extending vertically down from the left tree to the right tree.

That would make the segment be 25-10, or 15.

Then, we have a right triangle and we can solve for the hypotenuse, which is the length of the rope. (The bottom of the triangle is 20, and the leg is 15.)

We can use the pythag theorem: 15^2+20^2=c^2

c^2=225+400

c^2=625

c=25

Therefore, 25 meters

I hope the helped! If you have any further questions or concerns, please feel free to comment them below!

8 0

2 years ago