If it's described as my drawing:
The distance of downstream will be 375 * tan25 = 174.87 feet
Answer:
See below
Step-by-step explanation:
We want to prove that

Taking the RHS, note

Remember that

Therefore,

Once

Then,

Hence, it is proved
I do not know the last question but I know the first it is4 time I hope I am right
Arthur must earn $53 in the next week