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user100 [1]
2 years ago
7

Ron is planning for the back-to-school rush at his store. Last year he estimated that he would need 168 notebooks, but he sold 2

00 notebooks. What was the percent error of Ron’s estimate?
Mathematics
2 answers:
lakkis [162]2 years ago
6 0
I) 30 × 4 + (x - 30) × 5 < 200 

<span>(II) 20 × 4 + (x - 20) × 5 > 200 </span>


<span>Restated: </span>

<span>(I) 120 + 5x - 150 < 200; 5x < 230 </span>

<span>(II) 80 + 5x - 100 > 200; 5x > 220 </span>

<span>220 < 5x < 230 </span>
<span>44 < x < 46 </span>

<span>There are exactly 45 students in the class.</span>
IgorC [24]2 years ago
6 0

Answer:

Percentage error of Ron’s estimate is 16%.

Step-by-step explanation:

Formula

Percentage\ error = \frac{Change\ in\ value\times 100}{Exact\ value}

Where

Change in value = |Approx value - Exact value|

As given

Ron is planning for the back-to-school rush at his store.

Last year he estimated that he would need 168 notebooks, but he sold 200 notebooks.

Approx value = 168

Exact value = 200

Thus

Change in value = |168 - 200|

Change in value = |32|

Change in value = 32

Put all the values in the formula

Percentage\ error = \frac{32\times 100}{200}

Percentage\ error = \frac{3200}{200}

Percentage\ error = \frac{32}{2}

Percentage error = 16%

Therefore the percentage error of Ron’s estimate is 16%.

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RoseWind [281]

Hello there!

An equation to model this situation is 3n - 50 = -11

The unknown number has a value of 13.

Okay, so let's start by breaking down the question - we'll use <em>n</em> to model the unknown number.

-50 added to three times an unknown number equals -11?

This means we are adding -50 to something else. (We can use + -50 or - 50 since they are the same thing, I'll use - 50 since it's easier to follow.)

-50 added to three times an unknown number equals -11?

This phrase can be modeled as 3n. This is what we are taking 50 from, so we can add that to the end of the equation so far.

3n - 50

-50 added to three times an unknown number equals -11?

This can means the equation equals -11. We can model it as = -11. Now, let's add it to our equation.

3n - 50 = -11

Now, solve for n.

You want to start by canceling -50 out on the left side, so n is on it's own side, and to do this you add 50 to both sides.  

3n - 50 + 50 = -11 + 50

3n = 39

To finish isolating n, divide both sides of the equation by 3.

3÷3n = 39÷3

n = 13.

I hope this helps and have a great day!



7 0
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