Question

Gabrielle wants to put a border around her garden. It costs $1.50 per yard for the materials. Use 1.50 (2l + 2w), where l is the length and w is the width of her garden, to find the cost for a garden that has a length of 4 yards of a width of 3 yards.

Answer 1

Compute the perimeter then multiply by $1.50:

1.50(2l + 2w) = 1.50(2·4 + 2·3) = 1.50(8 + 6) = 1.50(14) = $21.

So the border will cost $21.