What is the name of the keyboard developed in the 1930s?

Whats three fourths of 15(this is supposed to be in math but i clicked too fast)

Perform an online search about the booting process of a computer and list all the steps

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