Please only correct answers!!

step-by-step explanation:

i need to answer questions so i dont know but i think its the first one because it goes up but a consent rate

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.