The vector parts that add up to the resultant are called

"Components"

Explanation:

A vector pointing in a particular direction can always be decomposed into multiple vectors whose sum yields that vector. These vectors are referred to as components. Most frequently, vectors are decomposed into its components in the context of coordinate systems. For example an origin vector of length sqrt(2) pointing up 45 degrees in a (x,y) coordinate system has an x-component (1,0) and a y-component (0,1).

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

answer///scientific method;