Answer:
210
Step-by-step explanation:
add 30 with 60 multiplied by 3
Answer:
if you are going 5 miles pr hour how many feet csn u walk
Step-by-step explanation:
the answer is we doont know
Answer: Simplified = 4n^2
Step-by-step explanation: the 8n and -8n cancel each other out.
Answer:94%
Step-by-step explanation:
Half life of a radioactive element is the time taken for half it's mass to disintegrate away.it means after attaining half life,what will be left is 100-50=50%.
Let the 100% mass of C-14,be x
Then 5730years=1/2 of X
Then 660 years=y of X
Where Y is the fraction of C-14 that has disintegrate as at 1988.
5730/660=1/2X/yX
5730/660=1/2/y
Cross multiplying
5730×y=660×1/2
5730y=330
Y=330/5730=0.05759
In %,5.76%
Amount of C-14 left is
100-5.76=94.24=94% as at 1988.