call. >> so, do you have your paperwork in front of you? >> yeah. >> okay. so, if you do three over four -- put that on your paper. >> oh. okay. >> and then do plus one over four. >> okay. >> okay, so, what's three plus one? >> four. >> okay. and then four over four is what? >> one? >> yeah! good job! >> reporter: antonia telling us tonight, she tries no matter what the emergency is. >> i always loved math in school so the fact he called in and i was able to assist in a problem i had myself when i was in fifth grade just took me back down memory lane. >> reporter: and that student, it turns out, not only thanked her, he said he was sorry. >> i'm sorry for calling you, but i really needed help. >> you're fine. we're always here to help. >> where was she when we were in school? we'll see you right back here pg&e is officially filing for bankruptcy.