Answer: 13.04
Here are some consumer price indexes from the past 100+ years:
Year CPI
1909 9.1
1919 17.3
1929 17.1
1939 13.9
1949 23.8
1959 29.1
1969 36.7
1979 72.6
1989 118.3
1999 166.6
2009 214.5
2015 238.5
The admission price was $1.00 in 1909. How much would the Speedway have had to charge in 1989 to match the purchasing power of $1 in 1909? In other words, how much was that in 1989?
Answer:

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

<u>Algebra II</u>
Step-by-step explanation:
<u>Step 1: Define</u>
6x² = 2x - 1
<u>Step 2: Rewrite</u>
- Subtract 2x on both sides: 6x² - 2x = -1
- Add 1 to both sides: 6x² - 2x + 1 = 0
<u>Step 3: Identify Variables</u>
a = 6
b = -2
c = 1
<u>Step 4: Solve for </u><em><u>x</u></em>
- Substitute [QF]:

- Exponents:

- Multiplication:

- (Square Root) Subtract:

- Factor:

- Simplify:

- Factor GCF:

- Simplify:
