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To find the cost of the border for Gabrielle's garden using the formula \( 1.50(2l + 2w) \), we first need to plug in the values for the length (\( l \)) and width (\( w \)) of the garden.
Given:
- Length (\( l \)) = 4 yards
- Width (\( w \)) = 3 yards
Substituting these values into the formula:
\[
1.50(2l + 2w) = 1.50(2(4) + 2(3))
\]
Calculating inside the parentheses:
\[
2(4) = 8
\]
\[
2(3) = 6
\]
Now add these results:
\[
2l + 2w = 8 + 6 = 14
\]
Now substitute this back into the formula:
\[
1.50(14)
\]
Now calculate the cost:
\[
1.50 \times 14 = 21
\]
So, the cost for the border around Gabrielle's garden is **$21.00**.