write each of the following in standard form ( scientific notation )

Answer:
V Down Below V
Step-by-step explanation:
21600 = 2.16 x 10^4
0.00007 = 7 x 10^-5
125 = 1.25 x 10^2
0.0000156 = 1.56 x 10^-5
I am pretty confident with those answers but sorry if they don't help friend!!