Based on what you're learned to this point in the class, why would you say it's so important for us to understand what geologic time is, and the principles on which it is based. Imagine you were speaking with someone who didn't get it - what would you need to show them to help understand? NOTE: I am looking for scientific content from earlier in the course here.

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

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