If f (x) =√ 7 − x, then which of the following sets is the domain of this function?

Square root must be greater than or equal to zero.

7 - x ≥ 0
   - x ≥ -7
     x ≤ 7

(-∞, 7]

1) This can nit be true since 4+0 is not a bigger sum!
2) Multiplying intergers can be a sum above the intergers or below.
3) This is true since 4*4 is 16 which is bigger than the intergers but 4*1 is the same and multiplying a negative number can result in a number lower than the interger.

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