<span>A complex number is a number of the form a + bi, where i = and a and b are real numbers. For example, 5 + 3i, - + 4i, 4.2 - 12i, and - - i are all complex numbers. a is called the real part of the complex number and bi is called the imaginary part of the complex number.</span>
Second option.
Functions are typically graphs that do not have a repeating y.
By going through each one of the given choices, you can deduce that only the second option has no repeated y values.
Hope this helps!
Answer:
I am sure that answer is 18.
I hope you got it
