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Your first question looks fine, and here's how to approach it.
If you are 5 feet 4 inches tall, it means you are 64 inches tall, and here's why:
There are 12 inches in each foot, and if there are 5 feet, that's 12 x 5, which is 60 inches. Plus the remaining 4 inches gives you a total of 64 inches.
Hope this helps!
Matt in NY