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3 years ago

If a school had 1531 students, about how many would you expect to have an IQ greater than 145?

Mathematics

1 answer:

Flauer [41]3 years ago

6 0

Answer:

Step-by-step explanation:

Approximately 95% of the population has IQ scores between 70 and 130. Approximately 99.7% of the population has IQ scores between 55 and 145. Only approximately 0.3% of the population has IQ scores outside of this interval (less than 55 or higher than 145).

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Wanni cycled 6 km from her house to the school at a uniform speed, v km/h. If she increased her speed

Karolina [17]

Answer:

The quadratic equation in terms of v is v² + 2 v + 180 = 0

Step-by-step explanation:

Given as :

The distance between house to the school = d = 6 km

The uniform speed = v km/h

So, Time = $\dfrac{\textrm Distance}{\textrm speed}$

or, t = $\dfrac{\textrm d}{\textrm v}$

Or, t = $\dfrac{\textrm 6}{\textrm v}$

<u>Now, Again</u>

The speed is increase by 2 km/h

i.e speed = (v + 2) km/h

So, Time taken = t' = (t - $\dfrac{4}{60}$ )hours

i.e t' = (t - $\dfrac{1}{15}$ )hours

Now, Time = $\dfrac{\textrm Distance}{\textrm speed}$

So, (t - $\dfrac{1}{15}$ ) = $\dfrac{\textrm d}{\textrm v}$

Or, (t - $\dfrac{1}{15}$ ) = $\dfrac{\textrm 6}{\textrm (v + 2)}$

Or , $\dfrac{\textrm 6}{\textrm v}$ - $\dfrac{1}{15}$ = $\dfrac{\textrm 6}{\textrm (v + 2)}$

Or , $\dfrac{\textrm 90 - v}{\textrm 15 v}$ = $\dfrac{\textrm 6}{\textrm v + 2}$

Or, (90 - v) × (v + 2) = 6 × 15 v

Or, 90 v - 180 - v² - 2 v = 90 v

Or, v² + 2 v + 180 = 90 v - 90 v

Or, v² + 2 v + 180 = 0

So, The quadratic equation in terms of v

v² + 2 v + 180 = 0

Hence The quadratic equation in terms of v is v² + 2 v + 180 = 0 Answer

3 0

4 years ago

18/34 as a reduced fraction

olya-2409 [2.1K]

I like to reduce everything by half if I don't already know the answer.

$\frac{18}{34} = \frac{9}{17}$

It just so happens that is the reduced fraction.

All I did was halve 18, which is 9, and halve 34, which is 17.

3 0

3 years ago

<img src="https://tex.z-dn.net/?f=2x%5E%7B2%7D%20%2B%204x%20%2B%206" id="TexFormula1" title="2x^{2} + 4x + 6" alt="2x^{2} + 4x +

JulijaS [17]

<h2>Answer:</h2><h2>2(x^2 + 2x + 3) or $2(x^{2} + 2x + 3)$ .</h2><h2>~</h2><h3>To find the answer, simply factor 2 out of 2x^2+4x+6 to get your final answer, </h3><h3>2(x^2 + 2x + 3)</h3><h2>~</h2><h3>Thank you for taking the time to read this!</h3><h3><u>And I hope you have a good day, Loves!</u></h3><h3><em><u>Also if I'm right can you let me know, please?</u></em></h3>

<em><u>Also Also if I am right can I please have Brainliest??</u></em>

<u>You don't need to, I'm just glad I could help. ^^</u>

(If I did help-)

And don't forget to eat a full meal, and have at least one cup of water today!

3 0

3 years ago

13 ft<br> 8 ft<br> Jjjjjjjjjjjjj

Yuri [45]

Answer: if it is area 108ft2

Step-by-step explanation:

I'm sorry but I dont know what your question is.

6 0

3 years ago

Evaluate 1 2/3 x 2 5/8

sergiy2304 [10]

Answer:

the answer to your question is 4 3/8 , hope this helps have a good rest of your day :)

5 0

3 years ago