Probably mostly numbers.
Textbook publishers nearly always publish an answer key. You can buy it from them if you have any business whatsoever having it (though, frankly, if you have any business having it you shouldn't really need it).
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The holder of a copyright, trademark, patent, or any other related right has certain exclusive rights to the creative work, commercial symbol, or invention which is covered by it
Creative expression is literally anything you want it to be. Any way that a person outwardly expresses themselves is creative expression.
Under US copyright laws Mr. Einstein's written and creative works became public domain in 2005, 50 years after his death, so essentially he earns nothing today. Although his works are still copied, published, bought and sold, there is no longer an obligation to pay anything to him or his estate.
analytical thinking is of a set rules and process of thinking. Creative thinking is outside the box and no set pattern.
A creative process over time.