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

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.

What formula  this one  (x_/

The answer is 12, for the points