Question

The perimeter of a rectangle is 13cm and its width is 11/4. find its length.

Answer 1

perimeter = 2 length + 2 width

P = 2(l) + 2(11/4)


`13 = 2l +2* (11)/(4)`


`13 = 2l + (2)/(1) * (11)/(4)`


`13 = 2l + (22)/(4)` (subtract 22/4 from each side)


`13 -(22)/(4) = 2l`


`13 -(11)/(2) = 2l`


`(26)/(2) -(11)/(2) = 2l`


`(15)/(2)} = 2l`


`7.5 = 2l` (divide each side by 2)

7.5 ÷ 2 = l

3.75 = l

The answer is 3.75 or
`3 (3)/(4)`