Answer:
Length = 15 inches
Step-by-step explanation:
Here we are given the width and the perimeter of the rectangle and we are required to find out our length. We will use the formula of perimeter in order to find the length.
The formula for perimeter
P=2(l+b)
where
l is length
b is width = 6
P is perimeter = 42
substituting them in formula we get
42=2(l+6)
dividing both sides by 2 we get
21 = l + 6
subtracting 6 from both sides we get
15 = l
Hence length is 15 inches
