Fifteen
15 = fifteen
Fifteen degrees.
" fifteen minus 'bee' "
fifteen minus b
fifteen million
You already have in the question.
15
15 million, seven hundreds and sixty-three thousand, one hundred an forty-five
There is more than 15 instruments techniques. Some of the techniques would be blow in, blow out, spit, line up and have fingers in place.
Oh, dude, it's like super simple. So, you could write 15-b as 15 minus b or as b subtracted from 15. It's like basic algebra, you know?
Write "9" then the forward slash "/" and then "15". Or you can write the 9 above a horizontal line with the 15 below that line.