1) It should be the opposite of what you put; 9 - n
2) Correct; y/22
3) Correct; 57 + b
4) Correct; 2/3x
5) Correct; c - 18
6) Correct; 2m + 25
7) Should be opposite of what you put; 8/2z
8) Correct; 2 + r²
9) I would just make the expression 40 - d since that's what it looks like your homework wants you to do; 40 - d
10) Correct; 1 + b
11) Correct; c/4
12) Not sure what you did there, but all you have to do to convert hours into minutes is to multiply the hours by 60; 60h
13) 75/5 = 15; Unit rate:
14) 600/8 = 75; Unit rate:
15) 32/4 = 8; Unit rate: