Answer:
D) 1.5 centimeters per night
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Algebra I
- Slope Formula:

Explanation:
Step 1: Define
Find points from graph.
Point (0, 30)
Point (20, 60)
Step 2: Find slope m
- Substitute:

- Subtract:

- Simplify:

- Divide:
