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forsale [732]
3 years ago
15

Pls help extra points and mark brainlist

Mathematics
1 answer:
igor_vitrenko [27]3 years ago
5 0

Answer:

2over/a -b-c

Step-by-step explanation:

remove the parentheses

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On Saturday morning, Owen earned $26. By the end of the afternoon he had earned a total of $57. Enter an equation, using x as yo
AnnyKZ [126]

Answer:

$26 + X = $57

$26 + $31 = $57

X = $31

My first time ever answering a question hope it helped =)  (And sry it took long)

Step-by-step explanation:

5 0
3 years ago
Your class is holding a bake sale to raise money for a field trip. If you are selling cakes for $3.25, what is the lowest you ne
Inessa [10]

Answer:

there needs to be at least 77 cakes sold

Step-by-step explanation:

let 'c' = # cakes sold

3.25c ≥ 250

c ≥ 250÷3.25

c ≥ 76.9

8 0
2 years ago
What is the coefficient of the term x7y in the expansion of (x + y)^8?
s344n2d4d5 [400]
<span>The coefficient for x^7*y is equal to 8Choose7 which is 8!/7! which is 8, or answer b. Pascal's triangle may be used to capture this as well, or use the exponent as above.</span>
3 0
3 years ago
25 equivalent expressions to 8x+12
-Dominant- [34]
Here are some
1 ) 4 ( x - 3 )
   2 ) 10 x - 2 x - 12
   3 ) 8 x - 4 - 8
8 0
3 years ago
These data can be approximated quite well by a N(3.4, 3.1) model. Economists become alarmed when productivity decreases. Accordi
CaHeK987 [17]

Answer:

First part

P(X< 3.4-0.6*3.1) = P(X

And for this case we can use the z score formula given by:

z = \frac{x- \mu}{\sigma}

And using this formula we got:

P(X

And we can use the normal standard table or excel and we got:

P(Z

Second part

For the other part of the question we want to find the following probability:

P(-1.715

And using the score we got:

P(-1.715

And we can find this probability with this difference:

P(-1.65< Z< 1.210)=P(Z

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the data of a population, and for this case we know the distribution for X is given by:

X \sim N(3.4,3.1)  

Where \mu=3.4 and \sigma=3.1

First part

And for this case we want this probability:

P(X< 3.4-0.6*3.1) = P(X

And for this case we can use the z score formula given by:

z = \frac{x- \mu}{\sigma}

And using this formula we got:

P(X

And we can use the normal standard table or excel and we got:

P(Z

Second part

For the other part of the question we want to find the following probability:

P(-1.715

And using the score we got:

P(-1.715

And we can find this probability with this difference:

P(-1.65< Z< 1.210)=P(Z

8 0
3 years ago
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