Why is Algebra, Calculous, or Trigonolmetry taught? When will is ever be useful?

MathMatics is in everything around us you need to know these features in order to succeed in life. Why? Because almost any job you need to know more than division, multiplacation, = and - say without Algebra, Calculous, and Trigonolmetry we woudnt have computers,TV's and almost everything thats powered by eletricity