Identify the following series as geometric or arithmetic. also identify the series as infinite or finite. 5, 10, 20, 40, 80, 160, 320

This sequence us geometric because you are multiplying by 2 each time to get the next term.  Anytime you are multiplying by the same thing, it is a geometric sequence.

This sequence is infinite because it would never end if you continued with the pattern.

20x + 5

all you really need to do is multiply the 4x and the 5. you just leave the + 5 alone