3 years ago

Write a 2-digit number using digits 2,9,4 draw a quick picture to show the value of your number

Mathematics

1 answer:

larisa [96]3 years ago

3 0

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The length of a rectangle is 4 centimeters less than twice its width. The perimeter of the rectangle is 34 cm. What are the dime

yarga [219]

Let l and w be the length and width of the rectangle. We know that $l=2w-4$

The formula for the perimeter is $P=2(w+l)$

Using our substitution, it becomes

$P=2(w+2w-4)=2(3w-4)=6w-8$

We know that the perimeter is 34, so we have

$6w-8=34 \iff 6w=42 \iff w=7$

The length is 4 less than twice the width, so we have

$l=2\cdot 7 - 4 = 10$

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