Which picture or pictures show a molecule?

a. a and c

b. b and c

c. only

d. b only

If a straight-chain hydrocarbon is a gas at room temperature, how many carbon atoms will it have? a. 6 carbon atoms b. 12 carbon atoms c. 24 carbon atoms d. 3 carbon atoms

If c + di is a point on the circle, then | c + di |=

Can anyone answer these questions? ? i need it before 1: 00pm today