Evaluate integral using substitution method - determine the

Question

QUESTION 1: Evaluate ∫_-1∫³ -1+ |x-1| dx

QUESTION 2: Evaluate integral using substitution method ∫e^x/(e^x + 1) dx

QUESTION 3: Evaluate integral ∫x sin?(x)dx

QUESTION 4: Find arc length of curve x = cos(t), y = sin(t) from t = 0 to t = Π

QUESTION 5: Determine the area enclosed by y = x² and y = √x