Question

The expression 4x gives the perimeter of a square with a side length of x units.

What is the perimeter of a square with a side length of 5/7 units?

Answer 1

`4x` where
`x = 5/7`


`=4 * 5/7`


`= 20/7`


`= 14/7 + 6/7`


`= 2`
`6/7`

Answer 2

The perimeter is
`(20)/(7)` units.

Explanation:

The expression
`4x` gives the perimeter of a square with a side length of x units.

So the function would be,

`f(x)=4x`

where,

f(x) is the function which gives the perimeter of the square, x as the side length.

As have to find the perimeter of a square with side length as
`(5)/(7)`, so we have to put x as
`(5)/(7)` in the function.

Hence, the perimeter will be,

`f((5)/(7))=4((5)/(7))=(20)/(7)` units