The solution to the second problem: this "77777777777" is .5761.
The solution to the third problem: the first one is white, the second one is red because he is not human, the third one is black because he is black, the fourth one is yellow because he is yellow, and the fifth one is mixed-race, so his face is reddish.
The answer to the fourth question: 9,890,980,908,809, and I don't know the rest.
Your question is so shocking that my younger brother admits failure. Most of the above are vague or random. By the way, did you give the question to ET?