15!/(15-9)!= 32432400
i hate these so much hope it helps! :)
20 students.
40% are boys. (40/100)*20 = 0.4 * 20 = 8 boys.
Girls= 20 - 8 = 12 girls.
25% of the boys wear glasses. = (25/100)*8 = 0.25*8 = 2 boys wear glasses.
50% of the girls wear glasses. = (50/100)*12 = 0.50*12 = 6 girls wear glasses.
Total students that wear glasses = 2 + 6 = 8 students.
8 students wear glasses.
12x12 + 12x12 = 288 = root of 288= 16.97
I'm probably not right, but that appears to be already rounded to the nearest tenth.
