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 and a width of 3 yards.

To find the cost for a garden with a length of 4 yards and a width of 3 yards, we can plug these values into the formula 1.50(2l+2w).

Substituting l = 4 and w = 3:
Cost = 1.50(2(4)+2(3))
Cost = 1.50(8+6)
Cost = 1.50(14)
Cost = $21

So the cost for a garden with a length of 4 yards and a width of 3 yards is $21.