Question

Given the function k described by k (x) = x + 18, how do you find k(9)?

Answer 1

See explanation below

Explanation:

You have to replace `x` by the number you are evaluating

The meaning of `k(x)` is a "machine" that transforms each number `x` to itself plus 18 units

In our case

`k(x)=x+18`, then `k(color(red)9)=color(red)(9)+18=27`
And so on....
`k(color(red)(2))=color(red)2+18=20`
`k(color(red)(-1))=color(red)(-1)+18=17`