Gabriella wants to put a border around her garden it cost $1.50 per yard for the materials used 1.50 (2L + 2W) where l is the length and w is the width of your garden to find the cost of the garden that has the length of 4 yds and the width of 3 yds

To find the cost of the border, we substitute the given values of length and width into the formula:

Cost = $1.50 * (2L + 2W)

Length (L) = 4 yards
Width (W) = 3 yards

Cost = $1.50 * (2 * 4 + 2 * 3)
Cost = $1.50 * (8 + 6)
Cost = $1.50 * 14
Cost = $21

Therefore, the cost of putting a border around Gabriella's garden is $21.