exam Maths Puzzle Numerical Ability

can you please help me solve this problem and show all work using the 5-step method: (((A sailboat travels 20 miles downstream in 3 hours. It returns in 4 hours. Find the speed of the sailboat in still water and the rate of the current.)))

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exam Other Question
Prove this:

(n ) (n)=(n+1)
(k-1) +(k)=(k)

Each "term" is supposed to be in the same parentheses but aligned on top of each other. "n" and "k-1" are in the same parenthe Subtract
4x^2 - 5x from the sum of 9x^2 - 2 and 6x - 1.

This is my answer is it right?
-5x^2 - x + 1