Well, darling, length times width divided by 144 gives you the area in square feet. So, if you're looking to convert square inches to square feet, just divide by 144. Simple math, honey!
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The formula for volume is length x width x height = volume. So if you take the volume and divide it by the length and width it should give you the height.
The volume of a rectangular prism is equal to length x width x height. Therefore, you have to choose the width so that the product of the three numbers is equal to the volume, i.e., equal to 144.
If the width is x then the length is x+15 and the perimeter is x+x+x+15+x+15 (length + length + width + width). So: x + x + x + 15 + x + 15 = 210 4x + 30 = 210 {group x's} 4x = 180 {take 30 from each side} x = 45 {divide by 4} The width is 45 feet.
the volume (v) is the product of the length (l), width (w) and height (h), v = l x w x h to get the width, divide both sides by length and height, to get w = v / (l x h)
Let the length be 2x and the width be x: Perimeter = 2(2x+x) = 84 4x+2x = 84 6x = 84 Divide both sides of the equation by 6 to find the value of x: x = 14 Therefore: length = 28cm and width = 14cm