1111111
7
The ones place in odd numbers will be odd (1, 3, 5, 7, 9)
7 tens and 4 ones 5 thousandths = 74.005
2, 3, 7, 8
0.6364
The prime numbers are 3 and 7 but 1 is not considered to be a prime or a composite number
232.107
We can't tell what those numbers are without spaces between them. Eliminate the ones that aren't multiples of 7, like 271, and proceed from there or re-submit the question.
No, binary numbers don't consist of ones and twos, they are ones and zeros.
103,743
-25
That's not quantifiable; numbers are infinite. You could choose an outrageously high number, its corresponding negative, and 5 sevens. If you restrict yourself to positive numbers, you could choose 6 ones and 43. The point of it is the 7 numbers need to total 49, whatever they are.