Mathematics, 26.07.2019 08:10 chyyy3

Ineed ! explain! i'm so confused! !

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Answer from: aud50

There are 2 14 year olds. The answer is (A).
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The average should be 12. 11 is one less than 12. You have four 11 year olds. You get a deficit of 1 with each 11 year old, so with four of them the deficit is 4. To compensate for this and being the average to 12, you need to make a surplus of 4. If you add one 14 year old, you make a surplus of 2 (because 14 is 2 more than 12). If you add another 14 year old, you now have a surplus of 4 and that balances it out.
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if it's hard to understand tell me and I'll explain it in the simpler way

Answer from: alvaradolm9723

Step-by-step explanation:

There are four 11-year olds and x amount of 14-years old.

We are given the average of this group of 11 and 14 year olds is 12.

This gives us the following equation to solve for x:

$\frac{4(11)+x(14)}{4+x}=12$

Doing some simplifying on the left and writing 12 as 12/1 on the right because I'm going to cross-multiply in the step to follow:

$\frac{44+14x}{4+x}=\frac{12}{1}$

Cross multiplying:

1(44+14x)=(4+x)(12)

Distribute:

44+14x=48+12x

Subtract 12x on both sides:

44+2x=48

Subtract 44 on both sides:

2x=4

Divide both sides by 2:

x=2

There are two 14-year olds.

Let's confirm.

You have four 11 year olds and two 14 years old.

So you have:

11,11,11,11,14,14

We want to find the average of this set of numbers.

You add the numbers and divide by the number of numbers.

$\frac{11+11+11+11+14+14}{6}=\frac{72}{6}=12$

This is the average the problem wanted us to obtain so the work we did above is correct.

Answer from: Quest

associative property of multiplication

Answer from: Quest

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

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Hey everyone! this question is a challenge question. for 50 points if you wish. all you have to do is answer the correct it has to be correct, in under 50 seconds, and i will make you the ! you want to accept this challenge. i already know! i mean, it's 50 free points! here is the question: 11x2= answer this correct, you get two prizes. don't forget. you only have 50 seconds or it wont happen. get it correct in under 50 seconds! that's not bad. so stop reading this long thing and !

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