Question

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Which property of addition is shown below?

If x = a + bi and y = –a – bi, x + y = 0.

commutative property
identity property
associative property
inverse property

Answer 1

inverse property because inverse properties show how something becomes 0

Answer 2

except for the one for multiplication it is sometimes called the zero property

Answer 3

Aiko is finding the sum (4 + 5i) + (–3 + 7i). She rewrites the sum as (–3 + 7)i + (4 + 5)i. Which statement explains the property of addition that she made an error using?
Aiko incorrectly used the commutative property by changing the order of the two complex numbers.
Aiko incorrectly used the associative property by changing the order of the two complex numbers.
Aiko incorrectly used the identity property by combining the real number and the coefficient of the imaginary part.
Aiko incorrectly used the distributive property by combining the real number and the coefficient of the imaginary part.