Find the sum of the average monthly rainfall.

The questions seems incomplete, so I will answer it in a general way. I suppose you have a table with the average monthly rainfall for each month (from January to December). To compute the sum of them just add together all of the average monthly rainfall.

For the case of the table attached, the sum is:

7.57 + 9.6 + 28.45 + 73.8 + 141. 31 + 267.6 + 314 + 275.1 + 336.47 + 171. 71 + 15.3 + 3.94 = 1644.85 mm

so far i think you have the right thing going for you just remember soh cah toh

step-by-step explanation:

sine over hypotenuse

cosine   equals adjacent

tangent over hypotenuse

my guess would be b and d, but i didn’t actually get out the pen and paper. lol