Which expression and diagram represent three times a number"?

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

Choose the more precise measurement. 26.4 cm or 8.39 cm

Why can't my rank go i have 1723 points, but my rank is only at ambitious, which is only 250 points! like, (p.s. i know this isn't related to math, but i just don't know why it's doing this and i would really appreciate if someone could tell me whats going on with this)