Answer:
9(x)-20(y)
Step-by-step explanation:
a regular polygon has 6 wall then it matters that the 54 walls
Check the picture below.
now, keep in mind that ship B is going at 20kph, thus from noon to 4pm, is 4 hours, so it has travelled by then 20 * 4 or 80 kilometers, thus b = 80.
whilst the ship B is moving north, the distance "a" is not really changing, and thus is a constant, that matters because the derivative of a constant is 0.
Answer: d = 40 - 5/2t; 1995
Hope it helps :)
25 and 60 as the parallel lines means they have wth same gradient