Answer:
-1.7f - 16
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS 
- Brackets 
- Parenthesis 
- Exponents 
- Multiplication 
- Division 
- Addition 
- Subtraction 
Algebra I
Explanation:
Step 1: Define
-2.2f + 0.5f - 13 - 3
Step 2: Simplify
- Combine like terms (f): -1.7f - 13 - 3
- Combine like terms (Z): -1.7f - 16