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Vladimir79 [104]
3 years ago
12

The length of a rectangle is 1 ft less than twice the width, the area of the rectangle is 21 ft squared. What’s the length

Mathematics
1 answer:
guapka [62]3 years ago
3 0

Answer:

The length of the rectangle is 6 feet

Step-by-step explanation:

Given as :

The length of rectangle is 1 feet less than twice the width

So, let The width of rectangle = w feet

The length of rectangle = ( 2 w - 1 )  feet

The area of the rectangle = 21 feet²

Now,

∵ The area of the rectangle = length × width

Or, 21 feet² =  ( 2 w - 1 ) feet × w feet

or, 21 = 2 w² - w

or, 2 w² - w - 21 = 0

or, 2 w² + 6 w - 7 w - 21 = 0

or , 2 w ( w + 3 ) - 7 ( w + 3 ) = 0

or, ( w + 3 ) ( 2 w - 7 ) = 0

So, w = - 3 feet , \frac{7}{2} feet

here we consider only positive value of w i.e  \frac{7}{2} feet

∴ The length of rectangle = ( 2 w - 1 )  feet

or,  The length of rectangle = 2 × \frac{7}{2}  - 1

Or, The length of rectangle = 7 - 1 = 6 feet

Hence The length of the rectangle is 6 feet , Answer

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Answer:

<h2>8</h2>

Step-by-step explanation:

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What’s the answer<br><br><br> 5n-2=n+18
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A local high school held a two-day fundraiser selling lunches. The equations shown represent the amount of money the school coll
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The given equations are

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Two cylinders are shown below. Which cylinder has the greater volume? Use 3.14 for π. Round to the nearest hundredth. Use the dr
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Step-by-step explanation:

I think your question is missed of key information, allow me to add in and hope it will fit the original one.  

Please have a look at the attached photo.  

My answer:

To find which cylinder has the greater volume, we need to find out the volume of each one.

As we all know that the formula used to determine the volume of a cylinder is:

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For example, in my attached photo, we will use this formula to find the volume of each one.

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