In chapter 12, Hezekiah says "Nowhere is the imagination less constrained than in a library." In your own words tell me what does he mean by this?

The only thing that limits our knowledge is ourselves, "less constrained than in a library" implies that a library is a limitless opportunity for knowledge. You could pick up any book and learn something from it. In this way, the library has more opportunity for learning and creativity than somewhere compared to, say a forest, where you're limited to the knowledge you gain from experiences or prior knowledge.

Explanation:

Hope this helps!

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.

it translates into:

read the letter of your pen pal. write and answer 3 questions.