3: Show that the set of differential real-valued functions f on the interval (-4,4) such that f’(-1)=3f(2) is a subspace of \mathbb{R}^{(-4,4)} 4: Suppose b \in R. Show that the set of continuous real-valued functions f on the interval [0,1] such that \int_{0}^{1}f=b is a subspace of \mathbb{R}^{[0,1]} IFF b=0 Additive Identity: assume \int_{0}^{1}f=b is a subspace