Answers

2014-10-24T10:00:09+08:00
Perimeter= 2L + 2w
    where L is the length and w is the width
given the perimeter and the width, we can now calculate the length

140 m = 2L + 2 (30 m)
140 m = 2 L + 60 m

isolate the variable L to one side of the equation by transposing the constant to the other side. we get:

140 m - 60 m = 2L
80 m = 2L

divide both side by 2 to get L

40 m = L
Length is equal to 40 meters


0