Location of barrier islands

Key Biscayne is known as a barrier island, and is found at the bottom end of a chain of islands that stretches along the southeastern coast of Florida. Barrier islands are build-ups of sand that form along the coast of larger land-bodies.

3 times 5 = 15, 4 - 13 = 9

Explanation:

you have to times 3 times 5 because h=5 and there is a three so 3 times 5= 15.

4 minus 13 because f=13. so 4 minus 13 = 9