Find the balance in the account after the given period. $4000 principle earning 3% compounded annually 6 years

How many $20 bills do you need to have to make $280

Solve the equation. 2x - 8(x+1)= 6(2x - 3)

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)