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.

2? if not the correct answer you might need to provide more information

step-by-step explanation:

the answer is 13

step-by-step explanation:

5*5=25

12*12=144

25+144=169

169^2=13