Leon is building a square picture frame. the side of the frame is 345 millimeters long. if a meter of wood costs $7, how much will the wood cost?

Since the picture frame is square, we know that every side is equal length. If one side is 345mm, then every side is 345mm.

Since we are building a picture frame, we want the perimeter of the frame. 
perimeter = 345mm + 345mm + 345mm + 345mm = 1380

We need 1380 millimeters which is equivalent to 1.38 meters.
We can multiply the number of meters by the cost of meters to find the total cost: 
1.38 * $7 = $9.66

The wood will cost $9.66

7.3

step-by-step explanation:

81+30=111180 minus 111=691/2×19=9.569÷9.5=7.263157895~7.3