Which properties are used to add these complex numbers? choose all that apply.
(7+2i) + (4+3i) = (7+4) + (2i+3i) = 11+5i
a. commutative property
b. distributive property
c. associative property
d. none of the above.

B. Associative Property , you're working out the numbers in the parentheses before anything else.

Properties used here are:

A. Commutative property.

C. Associative property

Step-by-step explanation:

Given the expression:  

(7+2i) + (4+3i)

(7+  2i) + 4 + 3i

According to associative property:

a + (b + c) = (a + b) + c

7 + (2i + 4) + 3i

Using commutative property:  

a + b = b + a

7 + (4 + 2i) + 3i

(7 + 4) + (2i + 3i)

Simplify:

11 + 5i

So, we use Commutative & Associative Property.

That's the final answer.

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step-by-step explanation:

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.