a wire 20m long is stretched from a temperature of 5degree celcius to 55degree celcius if the change in length is 0.02m, calculate the linear expansivity of the wire

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)