An equation that expresses a relationship between two or more variables, such as upper h equals nine tenths left parenthesis 220 minus a right parenthesis , is called the process of finding such equations to describe real-world phenomena is called mathematical such equations, together with the meaning assigned to the variables, are called mathematical

An equation that expresses a relationship between two or more variables, such as Upper H equals nine tenths left parenthesis 220 minus a right parenthesis , is called Formula.

A formula is an equation that expresses a relationship between two or more variables.

The process of finding formulas to describe real-world phenomena is called mathematical modeling.

Such equations, together with the meaning assigned to the variables, are called mathematical models.

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80

the battle of gettysburg is considered the "high water mark" of the confederacy because it marked the greatest advance of the confederate forces against the union.