is this correct then.

Why might fuction notations be important?
My answer:
a function notation shows how x computes based on an equation. The function of x means the given equation a certain value. Such as f(x)=x + 7. For example f(6)=6 + 7. So, f(6)=13
the function equals 13. The importance is to see the various ways equations with unknowns can be presented.

Yes, that is oK

How are functions notations useful in our daily lives?

we can use it every day in our live to solvo equations