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dimaraw [331]
2 years ago
6

Which expressions are equivalent to 9b?

Mathematics
2 answers:
djverab [1.8K]2 years ago
6 0

Answer:

A. b+2(b+2b)

b + 2b + 4b = 7b

B. 3b + b = 4b

C. 2(2b) = 4b

None of them are equal to 9b

sergiy2304 [10]2 years ago
5 0

Answer:

\fbox {None}

Step-by-step explanation:

<u>A</u>

  • b + 2(b + 2b)
  • b + 2(b) + 2(2b)
  • b + 2b + 4b
  • 7b

<u>B</u>

  • 3b + b
  • 4b

<u>C</u>

  • 2(2b)
  • 4b
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Liula [17]

Answer:

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Step-by-step explanation:

Let length of rectangle be "l"

Let width of rectangle be "w"

We know,

LENGTH is 2 MORE THAN WIDTH, we can write:

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Also, note the perimeter is the sum of all 4 sides of a rectangle, thus:

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Now,

The perimeter is given as 72, so we can write:

l + l + w + w = 72

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We have 2 equations that we need to solve and find the length (l).

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Rearranging, we have:

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We put this into 2nd equation and find the value of l:

2l + 2w = 72\\2l + 2(l-2) = 72\\2l+2l-4=72\\4l-4=72\\4l=76\\l=\frac{76}{4}\\l=19

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