I think this is the answer
Answer:
68
Step-by-step explanation:
A complex number has a real and an imaginary part
is a complex number
A complex number is represented as:
![a + bi](https://tex.z-dn.net/?f=a%20%2B%20bi)
Where:
<em />
<em> real</em>
<em />
<em> imaginary</em>
<em />
By comparing the options to
;
and
are not complex numbers
This is so because they do not have imaginary parts
However,
is a complex number
Because; 9i is imaginary
Read more about complex numbers at:
brainly.com/question/19007885
Answer:
31
Step-by-step explanation:
To solve this problem, we must find the lowest common multiple of 21, 35 and 63
Find the prime factors of the number;
Prime factors of 21 = 3 x 7
35 = 3 x 5
63 = 3 x 3 x 7
The lcm = 3 x 3 x 5 x 7 = 315
The numbers between 1 and 10, 000 divided by these three numbers;
First number = 315
Last number = 9765
Now the total number:
= ![\frac{first number - last number }{315} + 1](https://tex.z-dn.net/?f=%5Cfrac%7Bfirst%20number%20%20-%20last%20number%20%7D%7B315%7D%20%2B%201)
=
+ 1
= 30 + 1
= 31