Given the following production function: f(L,K)=L+K+(LK),Constant 1. If <1 What kind of return to scale this production function experiences? 2. If >1 What kind of return to scale this production function experiences? 3. If =1 What kind of return to scale this production function experiences? 4. Derive the marginal productivity of labor for this production function. 5. Derive the marginal productivity of capital for this production function. 6. Derive the marginal rate of substitution for this production function..