Convert the number 10111.11\(_{two}\) to a mixed number.
Subtract 14256\(_{seven}\) from 20045\(_{seven}\)
The average age of the four female teachers in a school is 40 and the average age of eight male teachers in the school is 25. Calculate the average age of the teachers in the school.
How many proper and improper subsets are there in the set K = { a, b, c, d, e}?
Differentiate Cos25º - Sin 25º
