(2.5 ×

) × (7 ×

)
First, simplify brackets. / Your problem should look like: 2.5 ×

× 7 ×
Second, simplify. / Your problem should look like: 17.5 ×

×
Third, simplify exponent. / Your problem should look like: 17.5 ×

Answer: B
Irrational since √3 is irrational
This is not a function. The input 7 in set A maps to outputs -1 and -3 at the same time in set B, which is why we don't have a function.
For a function to be possible, each input must map to exactly one output only.
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