Please provide step-by-step solution for the attached problem.

MICRO - (10-11-20) - harmonic ii harmonic ii. Consider following production function f(II, 12) = (1+ 7) A. Write down a function that gives ra as a function of I, and y and represents the isoquant for production level y. B. Prove this function is convex in ri for positive r1 and 12 C. Is the function f quasi-concave? How do you know? D. Is the function f homogeneous? If ao, of what degree? E. Is the function f concave? How do you know