Answer:

General Formulas and Concepts:
<u>Pre-Algebra I</u>
- Order of Operations: BPEMDAS
<u>Algebra I</u>
- Midpoint Formula:

Step-by-step explanation:
<u>Step 1: Define</u>
R (9, 3)
S (-1, -9)
<u>Step 2: Find midpoint</u>
- Substitute:

- Subtract:

- Divide:

Answer:
(-1,-8)
Step-by-step explanation:
Answer:
It's true because its a rational number.
Step-by-step explanation:
Answer:s>_18
Step-by-step explanation: