please help with these

4. If f x] 7? 0 for all real numbers, am ff f{x}dt = 2, which of the following tables could represent. the values for the function f [x]? O m r (w) 5 I] 5.4 3 [i 4 O x r (a) 5 5 5.4 5 5 8 O a: f (a) 5 I) 5.4 I] 5 I] O a: r (a) 5 4 5.4 2 6 1 O x r (a) 5 1 5'4 2 3 5. At which of the following points will F (:33) = f: f (t) dt always be equal to zero