Calculus
posted by Bobby .
A cruise ship's captain sets the ship's velocity to be 26 knots at a heading of 080 degrees. The current is flowing toward a bearing of 153 degrees at a speed of 8 knots.
What is the ground velocity of the cruise ship?

I see a triangle with sides 26 and 8 and the contained angle of 73°
The side opposite the 73° angles is the resultant
then
v^2 = 26^2 + 8^2  2(26)(8)cos 73°
take it from there