Answer:
6
Step-by-step explanation:
Look at picture for help solving it.
-(135/31), 60/31
y=60/31
x=-(135/31)
The half-life of the radioactive substance is 135.9 hours.
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(-1,-1) (0,3)
3- -1 / 0 - -1 = 4/1 = 4
slope is 4
