Answer
a) 2; b) 2; c) -4; d) 3
Work Step by Step
We are given the function:
$f(x)=[[x]]$ denotes the greatest integer less than or equal to $x$.
a) $f(2.1)=[[2.1]]=2$
b) $f(2.9)=[[2.9]]=2$
c) $f(-3.1)=[[-3.1]]=-4$
d) $f\left(\dfrac{7}{2}\right)=[[3.5]]=3$
