1. The problem statement, all variables and given/known data A friend gave me these problems to solve, believing they were calculus problems, which I did study over 10 years ago. They seem more related to economics, which I did not study. 2. Relevant equations 3. The attempt at a solution The only attempt I made was for Q3. H1=t H2=10-t B=1 Y= t^2 + (10-t)^2 + t(10-t) = t^2 + 100 - 20t + t^2 + 10t - t^2 = 100 - 10t + t^2 But do not know if this means it exhibit skill-complementarities or not. Any help is appreciated, and thanks in advance.