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Natali5045456 [20]
2 years ago
8

Which of the following is an example of a complex number that is not in the set of real numbers?

Mathematics
1 answer:
ExtremeBDS [4]2 years ago
8 0

A complex number has a real and an imaginary part

4 + 9i is a complex number

A complex number is represented as:

a + bi

Where:

<em />a \to<em> real</em>

<em />bi \to<em> imaginary</em>

<em />

By comparing the options to a + bi;

-7 and 2 + \sqrt 5 are not complex numbers

This is so because they do not have imaginary parts

However,

4 + 9i is a complex number

Because; 9i is imaginary

Read more about complex numbers at:

brainly.com/question/19007885

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Help me please please
telo118 [61]

Answer:

see below

Step-by-step explanation:

Standard equation for a circle with center h,k and radius r

(x-h)^2 + (y-k)^2 = r^2

so for this one   center =  (1,2)   radius = 4

6 0
2 years ago
Factor completely 56a2b3 − 35ab.
VMariaS [17]

I would start off by taking away 1a. That would make the problem be 56ab3-35b.I only took away 1 because each have at least 1a and is okay to do.


Next I would deal with the variable b. I would cross of 1 b. That's because both sides have at least 1b.  Now, it's shortened to be 56ab2-35.


Since you cannot take away anymore variables, you have to deal with 56 and 35. I start small with dividing each by 2. I am trying to see what the greatest number could be while making the numbers still be whole. That turns 56 into 28 when it's cut in half. The 35 now turns into 17.5.


I would assume your teacher would want the numbers to be whole. seeing as though when 35 is cut in half and makes a decimal number, I would leave them. What I mean by that is to leave the numbers as 56 and 35.


So, that means the answer is 56ab2-35.


I hope this helps!! (And makes sense)

5 0
3 years ago
The price of an item costs $13 to make. It is marked up $6.50 to sell. What is the percent marked-up
Whitepunk [10]

(1 + x) (13) = 13+6.5

13x + 13 = 19.5

13x = 6.5

x = 0.5

The item was marked up by 50%

4 0
3 years ago
Liam has $250. Then, he and his classmates bought a present for their teacher, evenly splitting the $p cost among the 24 of them
Semenov [28]

Answer: The required expression will be

\frac{6000-p}{24}

Step-by-step explanation:

Since we have given that

Amount that Liam has = $250

Amount that he and his classmates spent on  present for their teacher =$p

Number of students in which $p will split = 24

According to question,

Amount that left to Liam is given by

250-\frac{p}{24}\\\\=\frac{6000-p}{24}

Hence, the required expression will be

\frac{6000-p}{24}

4 0
3 years ago
Read 2 more answers
Need help with two of these! Thank you
astraxan [27]

Step-by-step explanation:

17) 3x+5-12+4x+2x

3x+4x+2x +5-12

8x-7

if x =6

8*6-7 =48-7

= 41

18.) 9(3x-4y+8)

27x-36y+72

6 0
3 years ago
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