A football coach paces back and forth along the sidelines during a close rivalry game. the diagram below shows several of the coach's positions and various times. At each marked positions, the coach makes a u-turn and moves the opposite direction. In other words, the coach moves from position a to b to c to d. (Could someone please explain this. Thank you)

area of focus

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

a cold ice-tea.

pour in room temperature or cold water. cover the pitcher and refrigerate. steep white or green tea for 6 to 8 hours; steep black or oolong tea for 8 to 12 hours.jun 28, 2015