If a 50microamps current is flowing then how many electrons pass a point each minute to 2 sig figs? add an explanation as i'm completely lost.

The equation you need to use is  where Q is the charge in C, I is the current in Amps and T is the time in seconds.

So we have T = 60s
I = A
let's work out Q
C
this is the total charge passing a point in a minute so divide by the charge of one electron () to find the number of electrons passing the point in a minute which equals 

45 is the correct answer