An oblique triangle ABC has internal angles ∠A=40∘ and ∠B=53∘, and the length of the side opposite to ∠C is c=30 (metres). Determine the length of the side opposite to ∠A, denoted a, to 2 decimal places.

Question

a=
Number
metres (2 decimal places).

Answer 1

Surely you must have found ∠C = 87°

Simple case of the sine law:
BC/sin40 = 30/sin87
BC = 30sin40/sin87 = ....

Answer 2

Hello. I dont understand question number 2 for the linear model part. this is the info i have:
burj khalifa
163 floors
2,717 feet

tokyo treehouse
29 floors
2080 feet

can you please solve or explain how to get the equasion.