The length of a rectangle is 12 inches and the perimeteris is 56 inches find the with of rectangle

X - the width of a rectangle
12 in - the length of a rectangle
56 in - the perimeter of a rectangle

2x + 2 · 12 = 56
2x + 24 = 56    |subtract 24 from both sides
2x = 32    |divide both sides by 2
x = 32 (in)

The width of a rectangle is 32 in.

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