Number Properties: PEMDAS
Parentheses, Exponents, Multiplication, Division, Addition, & Subtraction

1. Parentheses

There Are No Exponents, Multiplication, Division, Or Addition
2. Subtraction
The answer to your question is 95,460
A. f(1) = 1 + 3 = 4
b. f(6) = 2*6 = 12