Laptop computers are made with batteries, but they must also be plugged into outlets to charge the batteries. which is true regarding laptops? 1.they run only on alternating current.2.they run only on direct current.3.they can run on either direct or alternating current.4.they do not run on direct or alternating current.

The answer is C. This is because you cam recharge the battery (plug it in wall) and use the computer without charging when the battery is full. Same thing with phones.

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