As 25 foot building casts a 8 foot shadow. how tall is the building that casts a 20 foot shadow at the same time?

Suppose that the function f is defined. , for all real numbers, as follows. _ \ 1/4x² -4 if x≠ -2 f(x)=< /_-1 if x=-2 find f(-5), f(-2), and f(4)