Is 2x +4=5 (7, 5) a solution

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Find the average rate of change for the given function drom x=1 to x=2

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)