When do we use numbers instead of strings?

Technician a says that a dry sump system uses no oil storage sump under the engine. technician b says that a wet sump system uses no oil storage sump under the engine. who is correct?

Hazel has just finished adding pictures to her holiday newsletter. she decides to crop an image. what is cropping an image?

Which explains extrinsic motivation? a)motivation in which there is a reward b)motivation that is personally satisfying c)motivation that is personally meaningful d)motivation in which the subject is interesting