please help with the following macroeconomics question:

5. Check whether the functions: a) Y = RUNIT bj Y =2K + 3N. dj Y = 2N + 2, kalisly the following properties: i) Increasing in both inputs. i) Diminishing marginal products. ili) Constant returns to scale. iv) Complementarity between capital and labor. Use the fact that given a function of the form Y = A" Ne, its marginal products are given by MPK = ak-'N' and MPN = BK NA-1