1) what is function notions? 2) why is function notation used? 3) what does it mean by the expression f(x)?

1. function notation is the way a function is written.

2.the use of function notation makes it clear which is the dependent variable and which is the  independent variable in a functional relationship.

3.It means a formula, named f, has x as its input variable". It does not mean "multiply f and x''.

w'x is 0.

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