1/5+ (-4) is the same as 1/5 - 4
1/5-20/5
-19/5
840 centimeters ...there 100 centimeters in one meter
Answer:From the attached graphic, Half-life = ln (.5) / k
Half-life =.693147 / 0.1142
= 6.0695884413 days
Step-by-step explanation:The value of "k" should be negative and should have units associated with it.