Question 1 (1 point) What is the angle between the vectors 2 (2,5,7) and a\" a\" = (3,2, 3)? The angle is between 90 and 180 degrees. 1" The angle is between 0 and 90 degrees. The vectors are parallel (zero angle between them). 1:\" They are perpendicular (90 degrees). Question 2 (1 point) What do you need to compute a directional derivative, Da, b) ? {f A surface f, a point (a,b) A surface f, a point (ab), and a direction \"FL A surface f, a point (ab), a direction 113, and a derivative D. Question 3 (1 point) What do you get back when you compute Daf(a, b) ? I.e., what is the output of a directional derivative calculation? A vector parallel to V f, with length = slope. A vector parallel to u, with length = slope. O A scalar, the slope of f in the direction of uQuestion 4 (1 point) The figure below shows the contours of the temperature function T (a, y) along the wall in a room. 30 50- -20 25 -15- 20 - 15 y (meters) 15 10 10 10 50-60 10 - 30 -20- -15 -10 5 10 15 20 25 x (meters) 30 From the point x = 15, y = 15, in which of the following directions u is the directional derivative DT (15,15 ) negative and largest?\fQuestion 5 (1 point) The figure below shows the contours of the temperature function T (113, y) along the wall in a room. 30 r '53:) / / 16/ C) V 25 a? /15- 20 PM g