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Evaluating Functions
Use the function `f(x) = -6 x + 9` to answer the following questions
Evaluate `f(-6)`: `f(-6)= `
Determine `x` when `f(x) = 21` `x = `

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   x  x  √  n√  |   | (   ) π ∞ DNE
   x  √  (   ) π ∞ DNE
( ) ( ] [ ) [ ] —∞ ∞ ∪ DNE
< > ≤ ≥ or All Real Numbers DNE
log logn ln n√  | | e 
sin cos tan arcsin arccos arctan ⟨ ⟩
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