The number of represented by the expression is 1521 bacteria are present in each square centimeter of a person's skin.
An equation is an expression that shows the relationship between two or more numbers and variables. An independent variable is a variable that does not depend on other variables while a dependent variable is a variable that depends on other variables.
A standard form is a form of writing an equation, number, or an expression in a form using certain rules.
On each square centimeter of a person's skin, there are about $39^2$ bacteria. Hence:
1 cm² = 39² of bacteria = 1521
The number of represented by the expression is 1521 bacteria are present in each square centimeter of a person's skin.
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