6 is at least 20 and i can't read 7.... but hope this helps any ^-^
9 = x
subtract 3x from both sides of the equation and you're left with 9=x
3 is the common difference
I think that it is B because I'm pretty sure it has to be log of 50,000. But I forgot how to get the rest of it but B is the only one with log of 50k.
