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kari74 [83]
3 years ago
9

Please help! Please show all work! Thx!

Mathematics
1 answer:
OverLord2011 [107]3 years ago
4 0

Answer:

Part A)

86=2(x+22)

Part B)

l=26\text{ cm}

Step-by-step explanation:

We know that the rectangle has a length of (x+5) and a width of 12 cm.

Part A)

Remember the formula for the perimeter of a rectangle:

P=2(l+w)

We know that the perimeter is 86. Substitute that for P:

86=2(l+w)

Substitute (x+5) for the length l and 17 for w. So:

86=2((x+5)+17)

We can simplify this to acquire our equation:

86=2(x+22)

Part B)

To find the length, let's find our x first. We have the equation:

86=2(x+22)

Divide both sides by 2:

43=x+22

Now, subtract 22 from both sides. Therefore, our x is:

x=21

To find the length, remember that the length is:

l=x+5

Since we now know the value of x, substitute 21 for x:

l=21+5

Add:

l=26\text{ cm}

So, the length is 26 centimeters.

And we're done!

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