How do i solve the vertex of an equation/inequality?

Rationalize the denominator- 12x/√x-10

4. a single woman uses an online cash flow calculator which reveals a cash flow of 203. what does this mean?

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)