The length of a rectangle is 3 times it's width. the difference between the length and width is 8 feet. determine the rectangles length

Length=3w
width=w
Length-width=8
3w-w=8
2w/2=8/2
w=4
length=3×4=12

Iplay an instrument and i'm in band

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post