求翻译一道英文的物理题Find the sum of the following four vectors ((a) a

求翻译一道英文的物理题
Find the sum of the following four vectors ((a) and (b) for x and y components respectively), and as (c) a magnitude and (d) an angle relative to +x (including sign plus or minus).
P: 6.8 m, at 34o counterclockwise from +x
Q: 21 m, at 6.5o counterclockwise from +y
R: 8.9 m, at 31o clockwise from -y
S: 6.9 m, at 37o counterclockwise from -y