please answer correctly.

1. Three different forces act on an object. They are:
?F1=<3,?8>
?F2=<5,4>
?F3=<6,1>

Find the net force Fnet Fnet on the object (the sum of the forces)
Fnet=

Find what fourth force, F4 would need to be added so the object feels no force, that is, so Fnet=0
F4 =

2. Find the unit vector a? that points in the same direction as ???PQ where P (?2,3,8) and Q (5,6,3)

a? =