13. If a and b are positive integers such that a+b=9, then
69
what is the value of
40

Step-by-step explanation:

there is another part to the question

here

step-by-step explanation:

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.