Answer:
y=mx+b
-2(10)+b=-9
b=11
y=-2x+11
30 miles/1 hour is the unit rate.
Step-by-step explanation:
This is the unit rate because unit rates are a number over 1 unit. 30 miles/1 hour fulfills that, and the others are 2 and 3 hours.
25/7 I think not sure though
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90,502,084.19
Just add them together