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3 years ago

Can someone plz help me

Mathematics

1 answer:

dangina [55]3 years ago

3 0

Answer:

4j+24k

Step-by-step explanation:

Expand by distributing terms.

4j+4\times 6k

4j+4×6k

2 Simplify 4\times 6k4×6k to 24k24k.

4j+24k

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1) The ages of trees in a forest are normally distributed with a mean of 25 years and a standard deviation of 5 years. Using the

8090 [49]

Answer:

1) 68%

2) 68%

Step-by-step explanation:

<h2>1) The ages of trees</h2>

We know the mean and the standard deviation.

The mean is:

$\mu=25$

The standard deviation is:

$\sigma=5$

The Z-score formula is:

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

For x=20 the Z-score is:

$Z_{20}=\frac{20-25}{5}=-1$

For x=30 the Z-score is:

$Z_{30}=\frac{30-25}{5}=1$

Then we look for the percentage of the data that is between $-1$ deviations from the mean.

According to the empirical rule 68% of the data is less than 1 standard deviations of the mean. This means that 68% of the trees are between 20 and 30 years old

<h2>2) Pizza delivery </h2>

First we calculate the Z-scores

We know the mean and the standard deviation.

The mean is:

$\mu=27$

The standard deviation is:

$\sigma=3$

The z-score formula is:

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

For x=24 the Z-score is:

$Z_{24}=\frac{24-27}{3}=-1$

For x=30 the Z-score is:

$Z_{30}=\frac{30-27}{3}=1$

Then we look for the percentage of the data that is between $-1$ deviations from the mean.

According to the empirical rule 68% of the data is less than 1 standard deviations of the mean. This means that 68% of pizzas are delivered between 24 and 30 minutes

8 0

3 years ago

Please answer I need help badly

Vlad [161]

Symmetric property :).

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3 years ago

Graph: y +2 = - 3/4 (x+4)

ValentinkaMS [17]

Answer:

slope:-3/4

hope this helps!!:)

Step-by-step explanation:

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What effect does a scale factor equal to 1 have on the dimensions of the image being scaled?

FromTheMoon [43]

The scale factor equal to 1 will have No Effect on the dimensions of the image being scaled .

In the question ,

it is given that ,

the scale factor is = 1.

we have to find the effect of change ;

we know that ,

when the value scale factor is greater than 1 , then dimensions of new image is larger than original .

when the value of scale factor is 1 , then there is no change in the dimensions of the image .

when the value of scale factor is less than 1 , then the dimensions of new image is smaller than the original .

Therefore , if the scale factor is 1 , then there is no change in the dimensions of the image .

Learn more about Scale Factor here

brainly.com/question/29545968

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1 year ago

2x² + 3x – 5 =0<br> How to solve this with the quadratic equations

Xelga [282]

Copy and paste it on google it shows up the answers

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