Rewrite 3,000,000,000 as an expression with the power of 10

Which ordered pair is a solution of the equation? 2x+3y=10

Which angle has the same measure as the dehedral angle formed by the orange face and the purple rectangle

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)