To find: the dimensions of the rectangle
Answer to Problem 14P
The length of the rectangle is
Explanation of Solution
Given information: “The length of the rectangle is twice the width”, “The perimeter is 84 cm more than the width”
Concept Involved:
Perimeter of rectangle means sum of all the sides of the rectangle
Assign variable for the unknown that we need to find.
Use the keywords in the statement to rewrite the statement to meaningful math equation.
“is” means =
“shorter than” means -
Solve the equation by getting the variable in one side of the equation and undoing whatever is done to it by performing reverse operation.
Calculation: Assign variable for the unknown that we need to find
Let x be the width of the rectangle.
Write an expression to represent the length of the rectangle given the description “The length of a rectangle is twice the width”
2x is the length of the rectangle
Replace the keywords to get an equation representing the sentence given “The perimeter is 84 more than the width”
Combine like terms in right side of the equation
In the process of getting x in one side of the equation subtract x on both sides
Combine like terms on both sides
Divide 5 on both sides of the equation
Simplify fraction on both sides of the equation
Substitute 16.8 for x in the expression
Conclusion:
The length of the rectangle is 16.8 and width of the rectangle is 33.6
Chapter 3 Solutions
Algebra: Structure And Method, Book 1
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