Answer
a. $0$
b. $1$
Work Step by Step
a. As $t\to 4^+$, $\lfloor t\rfloor\to4$, we have $\lim_{t\to4^+}(t-\lfloor t\rfloor)=4-4=0$
b. As $t\to 4^-$, $\lfloor t\rfloor\to3$, we have $\lim_{t\to4^-}(t-\lfloor t\rfloor)=4-3=1$
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