We have a rectangle with width x ft., so the length is (x+5 ft.). The perimeter, or length of the border is equal to 2x+2(x+5 ft.) and cannot be longer than 180ft. This can be expressed as:
`2x+2(x+5)<=180`
`2x+2x+10<=180`
`4x+10<=180`
`4x<=180-10`
`x<=170/4`
`x<=42.5 ft.`
Thus the width needs to be less than 42.5 ft.
We’ll help your grades soar
Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.
- 30,000+ book summaries
- 20% study tools discount
- Ad-free content
- PDF downloads
- 300,000+ answers
- 5-star customer support
Already a member? Log in here.
Are you a teacher? Sign up now