Answer
$-3$
Work Step by Step
We can see from the graph that:
$f(−2.5)=2$
$f(1.9)=-2$
$f(-π)=3$
$f(−3)=2$
$f(1)=−2$
$f(π)=-4$
Thus: $\sqrt {f(-2.5)-f(1.9)}-[f(-\pi)]^2+f(-3)\div$ $f(1)\times$ $f(\pi)$
$=\sqrt {2-(-2)}-(3)^2+2\div (-2)\times (-4)$,
$=\sqrt 4$ $-9$ $+4=-3$
