It shows the relationship between two variables that is when one variable increases the other variable also increases. 

For two quantities x and y, an increase in x causes a decrease in y or vice versa. 

This is the kind of variation that involves both the direct and inverse variation. 

It occurs when a variable varies directly or inversely with multiple variables.

Translate the following statement into mathematical equations. 

"The distance D meters through which a body falls from rest varies directly as the time t in seconds "

Translate the following statement into mathematical equations. 

"The number of hours "n"  required to do a job varies inversely as the number of people "p" working together. "

Translate the following statement into mathematical equations. 

"The area A of a rectangle varies jointly as the base(b) and the height(h). "

Translate the following statement into mathematical equations. 

"The variable M varies directly as the product of A and T, and inversely as the square of H. "

It is the process of removing the radical in the denominator. 

Radical expression having the same order and the same radicand is called ___. 

Radical expressions with the different index and different radicands are called