The teenage yardstick inform his parents that (quoted) " I want to stand on my own three feet".
Why do people stand on their own feet?
People often want to stand on their one feet. t means that they do not want to depend on any one.
The teenager is one who has been dependent on his parents for a long time for everything and as such he wanted to live the life where he can fend for himself and as such as permission from the parents to trust him and allow him to stand on his own feet and solve the math problems by himself.
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