### Integration and continuity

6.Prove that if g(x) is nonnegative and continuous on [0, 1] and (integral from 0 to 1 of g(x)dx) = zero then g(x)= 0 on [0,1] 7. If f is continuous on [0,1] and if (integral from zero to one of (f(x) x^n)dx)) =0 for n in the Naturals, prove that f(x)=0 on [0,1]/ Hint: The integral of the product of f with any polynomial is