Math Problem Statement

A single $100 bill is approximately 0.0043 inches thick. If we were to stack 2.4999999999999997e+31 of these bills, the resulting structure would be mind-bogglingly tall. In fact, it would stretch for 2.87 × 10^13 light-years, far surpassing the observable universe's diameter of 93 billion light-years.

Solution

Let's analyze this statement step-by-step and verify the claim. We are given:

  • Thickness of a $100 bill: 0.00430.0043 inches
  • Number of $100 bills in the stack: 2.4999999999999997×10312.4999999999999997 \times 10^{31}
  • Total height in inches: This is calculated as the product of the thickness per bill and the number of bills.

We want to verify whether this stack indeed extends beyond the observable universe, which has a diameter of 93 billion light-years.

Step 1: Calculate the Total Height in Inches

Total Height=0.0043×2.4999999999999997×1031 inches\text{Total Height} = 0.0043 \times 2.4999999999999997 \times 10^{31} \text{ inches} Total Height=1.075×1029 inches\text{Total Height} = 1.075 \times 10^{29} \text{ inches}

Step 2: Convert Inches to Light-Years

1 light-year = 5.8786254×10125.8786254 \times 10^{12} miles
1 mile = 63,36063,360 inches
Therefore, 1 light-year in inches is: 1 light-year=5.8786254×1012×63,3603.7245×1017 inches1 \text{ light-year} = 5.8786254 \times 10^{12} \times 63,360 \approx 3.7245 \times 10^{17} \text{ inches}

Now, we divide the total height by the number of inches in a light-year to find the height in light-years: Height in light-years=1.075×10293.7245×10172.887×1011 light-years\text{Height in light-years} = \frac{1.075 \times 10^{29}}{3.7245 \times 10^{17}} \approx 2.887 \times 10^{11} \text{ light-years}

Step 3: Compare to the Diameter of the Observable Universe

The diameter of the observable universe is approximately 93 billion light-years (9.3×10109.3 \times 10^{10} light-years). Comparing: 2.887×1011 light-years9.3×1010 light-years2.887 \times 10^{11} \text{ light-years} \gg 9.3 \times 10^{10} \text{ light-years}

Conclusion

Indeed, the stack of these $100 bills would extend much further than the observable universe's diameter. The calculation shows that it would reach approximately 2.87 × 10^11 light-years, which is more than 3 times the diameter of the observable universe.

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Math Problem Analysis

Mathematical Concepts

Exponential Notation
Unit Conversion
Distance Calculation
Scientific Notation

Formulas

Total Height = Thickness per Bill × Number of Bills
1 light-year in inches = 5.8786254 × 10^12 miles × 63,360 inches/mile
Height in Light-Years = Total Height in Inches / Inches per Light-Year

Theorems

Basic Exponential Properties
Unit Conversion Principles

Suitable Grade Level

Grades 10-12