Question

sewing a border of ribbon onto her rectangular picnic blanket. The long side of the blanket is 70cm and the short side is 40cm. How much ribbon will she need?

Answer 1

`220` cm

Explanation:

We need to find the perimeter of the rectangular blanket in this case because a border is being sewn onto the blanket. The perimeter of a rectangle can be calculated by multiplying the sum of the rectangle's length and width by 2. As an algebraic expression, that would be
`2(l+w)`, where
`l` is the rectangle's length and
`w` is the rectangle's width. We are given that
`l=70` and
`w=40`. Therefore,
`2(70+40)=2*110=220` cm of ribbon will be needed. Hope this helps!