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4 years ago

several months after a forest is cut down, a nearby river becomes much muddier than ever before. Infer how the river changed

1 answer:

4 0

Well this is just my opinion but I think because all the plants were gone they cant stop mud from rolling into it. Also when it rains the trees wont suck up the water, that will make it over flow and release into the land or dirt on the outsides of it. Mixing those two gives mud and it can potentially flow back in the river in largeish masses causing the river to mix with the mud makinging it more muddy. Hope this helps :D

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Please help with 1 and 4

KIM [24]

Number 4 is : a light hour is a measure of time in space used to calculate the length of time between one object to another and one light hour equals 1.079 × 109 kilometers or 1.079e+9

5 0

3 years ago

Suppose Joe, who can type 40 words per minute, takes 2.5 hours to type his report. To speed things up, his friend Mark offers to

Vika [28.1K]

Explanation:

When Joe works alone, the total number of words he typed can be given by:

Total words = (40 words per minute) x (60 minutes per hour) x (2.5 hours)

Total words = 6000 words

Now, when Joe and Mark work together, let 'y' be the number of hours for which they both work simultaneously:

Total words = Words Typed by Joe + Words Typed by Mark

6000 = {(40 words per minute) x (60 minutes per hours) x (y hours)} + {(20 words per minute) x (60 minutes per hours) x (y hours)}

6000 = 2400y + 1200y = 3600y

y = 1.67 hours = 1 hour and 40 minutes

Thus, working together simultaneously, Joe and Mark will take 1 hour and 40 minutes to complete the report.

5 0

3 years ago

Relative to the ground, a car has a velocity of 15.3 m/s, directed due north. Relative to this car, a truck has a velocity of 22

bogdanovich [222]

Answer:

The magnitude of the truck's velocity relative to the ground is 35.82 m/s.

Explanation:

Given that,

Velocity of car relative to ground = 15.3 m/s

Velocity of truck relative to car = 22.5 m/s

We need to calculate the magnitude of the truck's velocity relative to the ground

We need to calculate the x component of the velocity

$v_{x}=22.5\cos\theta$

$v_{x}=22.5\cos52^{\circ}$

$v_{x}=13.852\ m/s$

We need to calculate the y component of the velocity

$v_{y}=15.3+22.5\sin\theta$

$v_{y}=15.3+22.5\sin52^{\circ}$

$v_{y}=33.030\ m/s$

Using Pythagorean theorem

$|v|=\sqrt{v_{x}^2+v_{y}^2}$

$|v|=\sqrt{(13.852)^2+(33.030)^2}$

$|v|=35.82\ m/s$

Hence, The magnitude of the truck's velocity relative to the ground is 35.82 m/s.

5 0

3 years ago

2. The _____ investigate crimes anywhere in the state.

GREYUIT [131]

Answer:

State Police

the police organized and maintained by a state as distinguished from those of a lower subdivision (such as a city or county) of the state government.

8 0

2 years ago

Read 2 more answers

Use technology and the given confidence level and sample data to find the confidence interval for the population mean muμ. Assum

Ronch [10]

Answer:

a. μ $_{95%} =$ 3 ± 1.8 = [1.2,4.8]

b. The correct answer is option D. No, because the sample size is large enough.

Explanation:

a. The population mean can be determined using a confidence interval which is made up of a point estimate from a given sample and the calculation error margin. Thus:

μ $_{95%} = x_$ ±(t*s)/sqrt(n)

where:

μ $_{95%} =$ = is the 95% confidence interval estimate

x_ = mean of the sample = 3

s = standard deviation of the sample = 5.8

n = size of the sample = 41

t = the t statistic for 95% confidence and 40 (n-1) degrees of freedom = 2.021

substituting all the variable, we have:

μ $_{95%} =$ 3 ± (2.021*5.8)/sqrt(41) = 3 ± 1.8 = [1.2,4.8]

b. The correct answer is option D. No, because the sample size is large enough.

Using the the Central Limit Theorem which states that regardless of the distribution shape of the underlying population, a sampling distribution of size which is ≥ 30 is normally distributed.

4 0

3 years ago