*EXTRA POINTS* Answer the boxes :)
First Dropbox option is “A geometric or an arithmetic” second box options is “common difference or common ratio” third box you type in.

Geometric sequence

common ratio

5

Step-by-step explanation:

this is multiplying by 5 each time which means that it's a geometric sequence

because it's a geometric sequence that means it's called a common ratio

find the geometirc sequence by dividing the first one by the second

10/2=5

15 / 2 = 7.5

100 / 7.5 = 13.