Mathematics

Problem

A rectangle has constant width

8\,\text{cm}

. If its length increases at

4\,\text{cm/s}

, find the rate at which the perimeter is changing when the length is

5\,\text{cm}

. a)

32\,\text{cm/s}

4\,\text{cm/s}

8\,\text{cm/s}

16\,\text{cm/s}