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## Homework Statement

Problem 2.2 An acre is defined such that 640 acres = 1 mi2. How many square meters

are in 1 acre?

## Homework Equations

Solution From Table 2.1,

1 mi = 1.609 km = 1609 m

1 acre = 1/640 mi ^2

## The Attempt at a Solution

My solution comes from wolfram alpha

4286 m^2

BOOK SOLUTION: 4.05 X 10^3 m^2

my on a calculator: 4045.13

So, why did wolfram get it wrong?

(1/604)(1609 m)^2 --> wolfram