What is th property of (3x10)x8=3x(10x8)

.mp4 files, because, video

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2

(x) - (y) = (1 + 4i)

he answer is x=1x3 because x=1 to x=3