Slope measures the steepness of a line. A way of displaying numerical data. A strategy is a careful plan. It helps you decide how you will do something. It is how you might try to solve a problem.
Subtraction means to take away part of or all of a group.
It is the inverse operation of addition. A symbol is something that stands for or suggests something else by reason of relationship or convention. It is a conventional sign used in writing or printing to represent operations, quantities, elements, relationships, or qualities.