Puzzle for a Puzzle-game (kinda) [Lv.0]

I could do the last 3 questions due to simple sequences but Q1 has me scratching my head... :/

Hint for Q1: think linear equations

bump

View attached image.

Beware, Uncompromising Mathematical Problems!
Or B.U.M.P. for short.

Bump for ugh.. solved.

Bump for not solved (yet?) !

There are 56 solvers now, but I still don't get any of them...

Bump for a nice one!

we know
q2,4 was easy, stuck on rest

Bump for solved