Hi Dalal,
In order to figure out how much the entire wire weighs, you have to multiply the length of the wire by the the weight of each meter.
7.6 m x 2.9 oz/m = ? oz total
You may then need to convert ounces (oz) to pounds (lb) depending on the answer format your teacher/homework requests.
There are 16 oz. in 1 lb.
So:
? oz total / 16 oz. = ? lbs of wire