7 base units?

Prefixes of the following multipliers:
a)10^12
b)10^9
c)10^6
d)10^3
e)10^-1
f)10^-2
g)10^-3
h)10^-6
i)10^-9
j)10^-12
k)10^-15

How to add scalar quantities?

How to add vectors along the same straight line?

vectors in opposite direction?

How to calculate perpendicular forces?
(Magnitude+Direction)

EXAMPLE:
If a trampolinist's initial speed at A is 6 m/s(down) & final speed at B is 10 m/s(Up)
What is the change in VELOCITY?