Iam stuck on this question d:scuba divers count fin strokes to estimate the distance they have travelled under water. felipe uses this method and a compass to swim 300 m north from the dive boat. he then turns right 120° and swims 400 m. how far from the boat is he, to the nearest metre? in what direction must felipe swim to return to the boat?

She's approximately 361 m from the boat. Since she turned 120 degrees and swimmed for 400 m, she went back a vertical distance of 400*1/2=200 m, so she's 300-200=100 m away vertically. Horizontally, her distance to the boat is 400*cos30=200*\sqrt(3) meters, and using pythagoren's theorem, the distance to the boat is 100*\sqrt(13)=361m.  Arctan (200*\sqrt(3)/100)=74 degrees, so she has to swim to south from west 90-74=16 degrees.

If i’m not wrong i believe it is c

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.