A motorboat traveling 4 m/s, East encounters a current traveling 7.0 m/s s, North. Motion of Motor Boat With Current Vincity What is the resultant velocity of the motorboat? B. What is the angle of the direction of the resultant motorboat? If the width of the river is 80 meters wide, then how much time does it take the boat to travel shore to shore ? D. What distance downstream does the boat reach the opposite shore?

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

0.02040816326

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)