Answer:

Step-by-step explanation:

14a^2bc^4/21abc^6 = 2a/3b^2
Think of PEMDAS, or Please Excuse My Dear Aunt Sally. Which is Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction in that order.
The answers are 6i/13 and -6i/13. The work it attached below
The sum of 4.35 and -5.66