Answer a): 117.7cm
Explanation: interpolation from the image shown below,
(2200-1430)/(2200-15) = (160-x)/(160-40)
770/2185 = (160-x)/120
92400 = 349600-2186x
2185x = 349600-92400
2185x = 257200
x = 257200/2185
x = 117.7cm annual precipitation
Answer b) yes,
Explanation: limitations exist such as the topography and geological characteristic of the ground below. This will affect precipation by the degree of wind hindrance they produce. Other factors like latitudinal and longitudinal coordinates of these places will affect their annual precipitation due to their relative position on earth, so its not just their elevation alone.
Answer c) blue canyon will have a mean annual temperature of about 7.57°c while Donner summit's will be at about 2.44°c
Explanation: according to meteorological data, temperature drops by 1°c for approximately every 150m rise in elevation. If Davis at 15m elevation has a mean annual temperature of 17°c, then for blue canyon, temperature drop -T will be;
-T = -(1430-15)/150 x 1°c = -9.43°c
Temperature at blue canyon = 17 + (-9.43) = 7.57°c
For Donner summit,
-T = -(2200-15)/150 x 1°c = -14.56°c
Temperature at blue canyon = 17 + (-14.56) = 2.44°c