What are relevant and irrelevant answers

Something that is relevant to a situation or person is important or significant in that situation or to that person.

Sometimes it's because the question is ridiculous enough, or otherwise challenged, that an irrelevant or joke answer seems to be all that it deserves. Other times, the answerer has received an A2A, and feels that they need to try to respond, even if they have no real answer to give. And sometimes it may be because they simply don't understand the question, and think that they are giving a good answer.

the answer is:  

he is voicing feelings shared by all humans regardless of race.

in paul laurence dunbar's poem "we wear the mask," he replicates the words mask and we to emphasize how people in general -not just black americans- hide their true feelings. he suggests the masks cover people's faces and eyes, which are the main parts that display their emotions. he also thinks people's pain conceal behind those masks, so that they cannot see reality and nobody is able to see one another's sorrow.

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.