Answer:
23
Step-by-step explanation:
With f(4), we plug 4 into the function.
f(4) = 4² + 7
f(4) = 16 + 7
f(4) = 23
0.49
for it to be rational there should not be no decimal nor pi .
Sorry, Don't Know.
ITS MUltipling by 3 silly its 243