Let r be the decay rate (time in minutes) 17 = 20 e^(5r) 0.85 = e^(5r) ln 0.85 = 5r similarly, ln 0.5 = hr ... where h is the half-life, so dividing the 2 equations, ln 0.85 / ln 0.50 = 5r / hr = 5/h h = 5 ln 0.50 / ln 0.85 h = 21.3 min b) 1/20 = 0.05, so ln 0.85 = 5r ln 0.05 = tr t = 5 ln 0.05 / ln 0.85 t = 92.2 min
Answer:
Step-by-step explanation:
what number line?? can u tell me in the comments then i will figure it out.
Answer: don’t mind me ima just type ggyuuffnfhhfhc
Step-by-step explanation:
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Answer:
4 + 
= 4
Step-by-step explanation:
We have 4 whole circles and half a circle so 4 + = 4
