Question

A particular beach is eroding at a rate of 4 centimeters per year. A realtor converts this rate to millimeters per day. Which expression, when evaluated, results in the correct units and numerical value?

Answer 1

4 centimeters is 40 millimeters
40 millimeters per year
divide by 365 (or 365.25) for millimeters per day
so 40/365

Answer 2

`(40)/(365)`

Explanation:

Given,

The beach is eroding at a rate of 4 centimeters per year,

So, the eroding per year = 4 cm,

∵ 1 cm = 10 mm,

Thus, the eroding per year = 40 mm,

Also, 1 year = 365 days,

That is, the eroding per 365 days = 40 mm

⇒ The eroding per day =
`(40)/(365)`

Which is the required expression.