Math Problem Statement

The length of a rectangle is five times its width. The perimeter of the rectangle is at most 96 cm.

Which inequality models the relationship between the width and the perimeter of the rectangle?

Responses

2w+2⋅(5w)>96 2 w plus 2 times left parenthesis 5 w right parenthesis greater than 96

2w+2⋅(5w)≥96

2 w plus 2 times left parenthesis 5 w right parenthesis greater than or equal to 96

2w+2⋅(5w)<96 2 w plus 2 times left parenthesis 5 w right parenthesis less than 96

2w+2⋅(5w)≤96

Solution

We are given that:

  • The length LL of the rectangle is five times the width ww. So, L=5wL = 5w.
  • The perimeter PP of a rectangle is given by P=2L+2wP = 2L + 2w.
  • The perimeter must be at most 96 cm, meaning P96P \leq 96.

Now let's substitute the expression for L=5wL = 5w into the perimeter formula:

P=2L+2w=2(5w)+2w=10w+2w=12wP = 2L + 2w = 2(5w) + 2w = 10w + 2w = 12w

We are told that the perimeter must be at most 96 cm, which gives us the inequality:

12w9612w \leq 96

This inequality corresponds to:

2w+2(5w)962w + 2 \cdot (5w) \leq 96

So, the correct response is:

2w+2(5w)962w + 2 \cdot (5w) \leq 96.

Would you like more details, or do you have any questions?

Here are 5 related questions for further exploration:

  1. How do you solve 12w9612w \leq 96 for ww?
  2. What would the dimensions of the rectangle be if the perimeter was exactly 96 cm?
  3. How do we calculate the area of the rectangle if the width is known?
  4. How does changing the perimeter affect the width of the rectangle?
  5. Can you create an equation for a similar problem with a different perimeter constraint?

Tip: Remember that inequalities like this can also help you model real-world problems, such as optimizing space or material usage.

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Math Problem Analysis

Mathematical Concepts

Algebra
Inequalities
Geometry

Formulas

Perimeter of a rectangle: P = 2L + 2W
Relationship: L = 5W

Theorems

Basic properties of inequalities

Suitable Grade Level

Grades 6-8