could anyone please help me out with this function question? thanks!

Question 5 (10 marks) Let f:D=[5+5] an be dened by x) = 1:91. (a) Use Denition 2.3 to prove that f is continuous at 1:0 E D. Hint: Think of a clever way to write .1:2 x that simplies the problem and remember that D = [5,5]. (6 marks) {b} Is f uniformly continuous on D? Briey explain. (2 marks) (c) Comment on the ooncavityfconvexity of f on D. (2 marks)