Answer:

General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
<u>Algebra I</u>
- Standard Form: ax² + bx + c = 0
- Quadratic Formula:

Step-by-step explanation:
<u>Step 1: Define</u>
4x² + 9x - 1 = 0
<u>Step 2: Define variables</u>
a = 4
b = 9
c = -1
<u>Step 3: Find roots</u>
- Substitute:

- Exponents:

- Multiply:

- Subtract:

Step-by-step explanation:
The offer is 25% sale on cupcakes
Single cake costs = 9
25% = 0.25
After discount the price of cake = 9 x 0.25 = 2.25
60+60 - hour heads up
80x-each hour travels 80miles
And both have a variable (x) that represent the number of hours
Equation:
60+60x=80x
Combine terms:
60=20x
Divide both sides by 20:
X=3
Soooo that means at 3:00pm two trains will be at the same distance from Chicago which is 240 miles
Hope this helps
Answer:
What do you want me to do? It is already solved
Step-by-step explanation: