# Fill in the bla?An equation that expresses a relationship between two or more variables, such as H = frac{9}{10} (20 - a) is called a/an ?

Fill in the bla?

An equation that expresses a relationship between two or more variables, such as $H=\frac{9}{10}\left(20-a\right)$ is called a/an ? 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 ?

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Step 1 There is a relationship between H and a. So it called a formula to get the value of H for different values of a. The process of finding such equations to describe real-world phenomena is called mathematical modeling. Step 2 Such equations, together with the meaning assigned to the variables, are called mathematical models.