If two lines intersect at a right angle, then they are perpendicular

This is TRUE!

The definition for perpendicular only applies when the lines are at a right angle which is 90°

in mathematics, a function is a relationship between two variables such that the value of one of the variables, called the dependent variable, is determined by the value of the other variable, called the independent variable. there is a specific term we use to describe the set of independent variables of a function.

there will be 35 boys in each team. : )