Answer:
11 + 13i
Step-by-step explanation:
A must know is that

Complex numbers
1st: foil the equations


2nd Combine like terms and substitute



Answer: 5
Step-by-step explanation:
a^2 + b^2 = c^2
12^2 + x^2 = 13^2
144 + x^2 = 169
x^2 = 25
square root both sides
x = 5
to check, do 12^2 + 5^2 =169
sqrt of 169 is 13
hope this helps
Answer: An equations is a number, a variable, or a combination of numbers and variables and operational symbols. An equation is made up of two expressions connected by an equal sign.
Example Expression: 8x+5y-3x-5
Example Equation: 5x-4=x
Hope this helps a little bit:)
Answer:
259
Step-by-step explanation:
USE PEMDAS
Parenthesis
Exponent
Multiplication
Division
Addition
Subtraction
The first one would be C and the 2nd is A.