Help me please :(

Function is a relation that the domain doesn't have the same/repetitive value in a single set.

Some set of relations have repetitive domain

For example, {(1,1),(1,2)} This is NOT a function.

But {(1,1),(2,1)} is a function because there are no repetitive domains.

Therefore the answers are first choice, second choice and fifth choice.

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.

[2, 2.5)

(2.5, 3]

step-by-step explanation:

i think its these two not sure [2, 2.5)

(2.5, 3]