Answer:
(1) n = 9
(2) n = 15
(3) r = -8
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Step-by-step explanation:
1.4=n/9+3
4-3=n/9
1=n/9 cross multiply
2. -7=-8+n/15
-7+8=n/15
1=n/15 Cross multiply
n=15
3.-11=r/2-7
-11+7=r/2
-4=r/2cross multiply
-8=r
r=-8
