Please help me, main question in first slide (ASAP)

Investor's Problem Max E(U)= E(r) - .5A 0 (rd * E(rp)- rf Ao 2 Let A = 2, then y* = E(r) = ord = What if A=4? 15 Investor's Problem cont'd Erc) 13.64%=E(rc). y*=0.83 IF rf = 7% Oc = 18.26% o 16 Investor's Problem cont'd Erc) ?=E(rc) y*=? rf = 7% Oc =? 17 Investor's Problem Max E(U)= E(r) - .5A 0 (rd * E(rp)- rf Ao 2 Let A = 2, then y* = E(r) = ord = What if A=4? 15 Investor's Problem cont'd Erc) 13.64%=E(rc). y*=0.83 IF rf = 7% Oc = 18.26% o 16 Investor's Problem cont'd Erc) ?=E(rc) y*=? rf = 7% Oc =? 17