Mathematics and other subjects share an inherent relationship. It means that they are, in many cases, inseperable from each other.
Subjects such as physics, chemistry, geography, economics and many more, would be incomplete at best, if not completely non-existent, without Mathematics. It posseses a variety of applications in regards with other subjects. Some of the examples are:
1) Geography: used in weather prediction or impact of atmospheric change on aquatic and non-aquatic life.
2) History: used to find out the exact historical period from which various artifacts - sculptures, everyday objects, weapons, etc. come from.
3) Economics: Helps in calculating various indexes like inflation, crop production etc.
4) Science: Heavily used in every application like motion, gravitation, work, energy, electricity, magnetism etc.