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To find the number of people who have watched the video after 3 days using the function \( y = 4(6)^t \), we can substitute \( t \) with 3:
\[
y = 4(6)^3
\]
Now calculate \( (6)^3 \):
\[
(6)^3 = 6 \times 6 \times 6 = 216
\]
Next, multiply that by 4:
\[
y = 4 \times 216 = 864
\]
Therefore, the number of people who have watched the video after 3 days is **864**.