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Answer:
Eric:
y=8h+85
125=8h+85
125-85=8h-85+85
40=8h
5 hours
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school temp
y=7t+22
36-22=7t+22-22
t=2
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mrs.weaver
y=3c+4
22-4=3c+4-4
c=6
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joshua
y=14-3s
50-14=-14+14-3s
s=12