Answer:
1)
7+9-15 = add 7 and 9, then subtract 15
2)
15-(7+9) = The sum of 7 and 9 subtracted from 15
3)
15-(7+9) = subtract 7 from 15, then add 9
Explanation:
Learn BODMAS. The order of how to do equations. A simple tutorial on yt should be sufficient