Why does Bartoletti explain all the research she did?

Afruit stand has to decide what to charge for their produce. they decide to charge \$5.30$5.30dollar sign, 5, point, 30 for 111 apple and 111 orange. they also plan to charge \$14$14dollar sign, 14 for 222 apples and 222 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

Which sentence best build the suspense

Short stories by male dark romantic writers explored insanity, also called madness, as suffered by young women. what is the tone of this passage?