All categories

3 years ago

Hi everybody can you help me i really thank you each qusesion is 10 pioints

Mathematics

2 answers:

Paha777 [63]3 years ago

6 0

Answer:

Travis made mistake in 2nd step..

Step-by-step explanation:

because according to DMAS , we use first division in the equation,then multiplication, then addition and then subtraction.

D-Division

M-multiplication

A-addition

S-subtraction

:-befrank

Helen [10]3 years ago

4 0

Answer:

Step 3

Step-by-step explanation:

In Step 3, he divided 8 by 4 when he should've done 32 divided by 8 first.

(I don't know if it's considered to be in Step 2 or Step 3, so if Step 3 is wrong, then it's Step 2.)

I hope this helps! Have a lovely day!! :)

You might be interested in

Brock heard that as a general rule, he should spend no more than one week's pay on rent. If Brock's salary is $25,200 per year,

olasank [31]

There are about 52 weeks in a year, so divide 25200 by 52 (484.6). He gets paid $484.60 per week. So he should spend a maximum of C. $485 on rent per month.

8 0

3 years ago

Read 2 more answers

A television station plans to ask a random sample of 400 city residents if they can name the news anchor on the evening news at

hodyreva [135]

Answer:

There is an 8.38% probability that the anchor will be fired.

Step-by-step explanation:

For each resident, there is only two possible outcomes. Either they can name the news anchor on the evening news at their station, or they cannot.

This means that the binomial probability distribution will be used in our solution.

However, we are working with samples that are considerably big. So i am going to aaproximate this binomial distribution to the normal.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

Can be approximated to a normal distribution, using the expected value and the standard deviation.

The expected value of the binomial distribution is:

$E(X) = np$

The standard deviation of the binomial distribution is:

$\sqrt{V(X)} = \sqrt{np(1-p)}$

Normal probability distribution

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

When we are approximating a binomial distribution to a normal one, we have that $\mu = E(X), \sigma = \sqrt{V(X)}$ .

In this problem, we have that:

400 city residents are going to be asked. So $n = 400$ .

Suppose that in fact 12% of city residents could name the anchor if asked. This means that $p = 0.12$ .

So,

$\mu = E(X) = 400*0.12 = 48$

$\sigma = \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{400*0.12*0.88} = 6.5$ .

They plan to fire the news anchor if fewer than 10% of the residents in the sample can do so.

What is the approximate probability that the anchor will be fired?

10% of the residents is 0.10*400 = 40 residents.

Fewer than 10% is 39 residents. So the probability that the anchor will be fired is the pvalue of Z when $X = 39$ .

So:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{39 - 48}{6.5}$

$Z = -1.38$

$Z = -1.38$ has a pvalue of 0.0838. This means that there is an 8.38% probability that the anchor will be fired.

5 0

4 years ago

I need help plz plz

marta [7]

Answer:

the equation would be (x-5)^2 + (y-(-3)^2= 4^2

Step-by-step explanation:

How I got this was you keep the equation and fill in the blanks with the points.

So the first blank with (x-?)^2 would be 5 because that is your x point.

The second blank with (y-(?))^2 would be -3 because that is your y point.

The last blank would be 4^2 because that is your radius

Let me know if you need more

6 0

3 years ago

Which table represents a linear function? <br><br> I will mark brainliest

Alborosie

Table number four represents a linear function

7 0

3 years ago

Read 2 more answers

How mlong would it take to dig a hole 10 m by 10 m by 10 m?

deff fn [24]

That depends on how quickly the hole is being dug. First, you have to find how many cubic feet this hole is. That's fairly simple; length times height times depth equals volume, so the hole is 1,000 cubic feet. Say you're digging at one cubic foot per ten minutes, then it would take you 10,000 minutes (166 hours, about seven days) so just under a week to dig a hole at that rate.

4 0

3 years ago