Question 6 (1.5 points): Which of the following is a parametrization of the curve given by x + y = 4?
A) r(t) = (t, 4 - t), t ∈ [0, 4]
B) r(t) = (4 - t, t), t ∈ [0, 4]
C) r(t) = (t, 4 + t), t ∈ [0, 4]
D) r(t) = (4 + t, t), t ∈ [0, 4]
Question 7 (1 point): Find the derivative of the function f(x) = √(x^2 + 1).