Answer:
It will take 50 years to decay from 512 grams to 121.5 grams.
Step-by-step explanation:
The decay formula :

where
N= amount of substance after t time
N₀= initial of substance
t= time.
A substance decays at a rate 25% every 10 years.
So, remaining amount of the substance is = (100%-25%)= 75%
, t= 10



Taking ln both sides



Now , N₀= 512 grams, N= 121.5 grams, t=?




Taking ln both sides




⇒t=50 years
It will take 50 years to decay from 512 grams to 121.5 grams.
Answer: 2√33
Step-by-step explanation: First we will find all factors under the square root: 132 has the square factor of 4. Let's check this width √4*33=√132.
If she ran 2 kilometers , isnt it 8 minutes ?
Answer: 3e-1
Step-by-step explanation: when it's going behind the decimal it will always be negative plus the reason it's one is because if you slide the decimal once it'll be the complete opposite