josh3514
Answered

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Perimeter

plsss help

Perimeter Plsss Help class=

Sagot :

SohamDubey

Step-by-step explanation:

l= 3x+2cm

b=4cm

Perimeter of the rectangle= 68cm

Now, according to the formula, the perimeter of a rectangle= 2(l+b)

Therefore,

2(l+b)=68

2{(3x+2)+(4)}=68

2{3x+2+4}=68

2{3x+6}=68

6x+12=68

6x=68-12

6x=56

x=56/6

x≈9.33

In order to cross-check this answer, we compute in the values so therefore,

3x+2=3(9.33)+2=27.99+2=29.99≈30

Now, substituting this value in the formula we get,

2(30+4)= 68

The reason for cross-checking was to re-assure because of the decimal value of 9.33, that is why I approximated the expression to 30 in order to get the exact value of 68. otherwise using the decimal value of 9.33 computes an answer of 67.98 which off by a difference of 0.2.

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