A 57.6 B. 100.8 c.78.2 I’m not sure
8 because 12-4=8. Im writing this part for the 20 characters
If it says 3×8 its like saying 8+8+8=21.
It's just a faster way of adding.
Anything multiplied by 0 is 0.
Anything multiplied by 10 just add a 0 to the end of the number example 10×2=20.