What’s the correct answer for this?

Secant be and cf intersect at point d inside a what is the measure of cde

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)

What is the value of x in the equation 1/5x - 2/3y = 30 , when y = 15