Answer:
-2x² - 5x + 16
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
<u>Algebra I</u>
Step-by-step explanation:
<u>Step 1: Define</u>
(-10x² + 9) + (8x² - 5x + 7)
<u>Step 2: Simplify</u>
- Combine like terms (x²): -2x² + 9 - 5x + 7
- Combine like terms (Z): -2x² - 5x + 16

Example:
5w - five apples
8 - eight strawberries
5w + 8 = (five apples) + (eight strawberries) = 13 of what?
You can add only numbers of the same fruits.
Answer:
12% of 60, 400% of 18, 55% of 220
Step-by-step explanation:
12% of 60 =7.2
55% of 220 = 121
400% of 18 = 72
7.2, 72, 121
C 1/2 is the correct answer