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3 years ago

I will give brainliest if you add details:

Mathematics

1 answer:

Sunny_sXe [5.5K]3 years ago

5 0

Answer:

53 1/3% for the first answer, and 33 1/3% increase for the second answer

Step-by-step explanation:

Ok, lets start up witht eh first question.

We need to find the percentage of studens that find math the be their favorite subject in elementary school.

We know that there are 15 kids in total.

We specificly see that 8 of those kids like math the most.

To find percentage, divide 8 by 15.

Using a calculator you should find 53 1/3% of the students found math to be their favorite subject.

Next we need to find the percentag eof change that history is over elementary school to high school.

This might sound confusing, but this is basically just a change of 3 students to 4 students.

To find percentage, just divide 3 by 4:

This gets you 33 1/3%

Hope this helps!

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murzikaleks [220]

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3 years ago

Read 2 more answers

The lenght of the library is 13 inches.The lenght of the actual library is 78 feet. Which scale leon use to create the scale dra

Allisa [31]

So the scale used was

1 inch = 6 feet

Step-by-step explanation:

Given

Length of library on drawing = 13 inches

Actual length of library = 78 feet

In order to find the scale we divide the actual length by the length of library on drawing.

So,

Scale = $Scale = \frac{Actual\ length}{Length\ on\ drawing}\\=\frac{78}{13}\\=6$

So the scale used was

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Keywords: Scale, Maps

Learn more about scaling at:

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3 years ago

Find one value of x that is a solution to the equation (x^2+3)^2=4x^2+12

Westkost [7]

Answer:

${( {x}^{2} + 3) }^{2} = {4x}^{2} + 12$

$\bf \purple{ {(x + y)}^{2} = {x}^{2} + 2xy + {y}^{2} }$

${( {x}^{2}) }^{2} + 2({x)}^{2} (3) + {(3)}^{2} = {4x}^{2} + 12$

${x}^{4} + {6x}^{2} + 9 = {4x}^{2} + 12$

${x}^{4} = {4x}^{2} - {6x}^{2} + 12 - 9$

${x}^{4} = { - 2x}^{2} + 3$

$( {x}^{2} \times {x}^{2}) = { - 2x}^{2} + 3$

$2 \times {x}^{2} = { - 2x}^{2} + 3$

$= \frac{ { - 2x}^{2} + 3 }{ {2x}^{2} }$

$= 3$

4 0

3 years ago

Help anyone can help me do this question,I will mark brainlest.

Kay [80]

Answer:

Hello,

Step-by-step explanation:

Loi d'Ohm: U=R*I

a) U=20*0.5=10 (amp)

b) I=U/R=50/0.5=100 (amp)

7 0

3 years ago

A random sample of 85 adults found that the average calorie consumption was 2100 per day. Previous research has found a standard

denpristay [2]

Answer:

$15600

Step-by-step explanation:

Minimum number of samples can be calculated using the formula:

N≥ $(\frac{z*s}{ME})^2$ where

N is the sample size
z is the corresponding z-score for 95% confidence level (1.96)
s is the standard deviation of the calorie consumption (450 cal.)
ME is the margin of error that the researcher is willing to accept. (50 cal)

N≥ $(\frac{1.96*450}{50})^2$ =311.2

Therefore, minimum required sample size for 50 cal standard error in 95% confidence is 312

Since the survey costs $50 for each person then the survey costs minimum

50*312=$15600

5 0

3 years ago