(Refer to figure 68.) What is the VASI approach slope angle for RWY 12 at Houma Terrebonne?

(Refer to figure 136.) Which illustration would a pilot observe if the aircraft is on a glidepath higher than 3.5°?

(Refer to figure 49.) What is the usable runway length for landing on runway 21 at PDX?

(Refer to figure 135.) Which illustration would a pilot observe if the aircraft is below both glidepaths?