Given the vector u equal to 4 (cos 175°, sin 175°) and vector v equal to 5 (cos 65º, sin 65°), find the sum u + v and write your answer in magnitude and
direction form with the magnitude rounded to the nearest tenth and the direction
rounded to the nearest degree, 0°

2y+y=5

add 2y and y

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

the answer for the second equation is (4,0)