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alexira [117]
3 years ago
12

Identify the number that does not belong with the other three. Explain your reasoning. negative 10 over 2, negative 13.4, square

root 18, 22.7 repeating 7
Mathematics
2 answers:
11111nata11111 [884]3 years ago
8 0
Sqrt 18 I believe :)
Anna35 [415]3 years ago
3 0

Answer: √18

Step-by-step explanation:

The numbers in the list are:

-10/2  

-13.4

√18

22.777....

First, let's define two groups:

Rational numbers: Are those with a finite number of decimals after the decimal point, or with a pattern that repeats infinitely after the decimal point (like in the 22.77... with the 7 repeatings)

These types of numbers can be written as the quotient of two integer numbers.

Irrational numbers: Have infinite decimals after the decimal point and there is no pattern at all, they can not be written as the quotient between two integer numbers. Square roots of numbers that are not perfect squares (the solution is an integer) are irrational numbers.

Here, with that definition, we can see that: -10/2, -13.4 and 22.77...

are rational numbers, now let's see √18

We know that 4*4 = 16, and 5*5 = 25

so there are no integer X such x*x = 18

Then √18 is an irrational number and is the one that does not belong in the list.

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For a markup, use the formula <em>a = ( 1 + p ) × w. </em>

!!! Remember, <em>a </em>is the selling price, and <em>w </em>is the original price !!!

!!! The <em>p </em>is the percent in decimal form. 20% as a decimal is 0.20 (move the decimal twice to the left) !!!

<em />

Inserting the values, it should look like <em>a = ( 1 + 0.20 ) × 20 </em>

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Hence, the new selling price is $24.

Hope this helps! :)

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