How did the dinosaur feel before the algebra test punchline book b answers?

Right before the big algebra test, the dinosaur felt like he was a nervous rex (nervous wreck, get it?).

This showcases a play of words in the Punchline Algebra book, wherein the answers somewhat rhyme with the correct word that describes the situation.

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.