A forest warden on look out duty in an observation tower notices smoke directly north of his position. From a second tower, situated 5 km due east of the first,
another warden sees the smoke on a bearing of 335º. How far is the smoke from the
first observation tower? Round your answer to one decimal place.

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

false

step-by-step explanation: