<span>60.5 milligrams per square centimeter
First, determine how many half lives have expired by dividing the time by the half-life. So:
55/20 = 2.75
That means that only 2^(-2.75) = 0.148650889 = 14.8650889% of the original substance remains. So just divide the amount remaining by 0.148650889 to get the original amount.
9 / 0.148650889 = 60.5445419
So originally, there was 60.5 milligrams per square centimeter 55 years ago.</span>
Answer:
x=2
Step-by-step explanation:
<u><em>FINAL ANSWER</em></u>
<em>x=2</em>
3.50÷7 = £0.50 per cake
5 cakes = 0.5 x 5 = £2.50
(4logs/2hours) = (x logs/8 hours)
(4/2) = x/8)
Cross multiplication gets you:
(4)(8) = (2)x
32 = 2x
x = 16
16 logs
The area is 40 because you do 12 times two then eight times two then add the awnsers
