Answer:
29/34
hope this helps
Step-by-step explanation:
Answer:
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.
Answer:172.5
Step-by-step explanation:Xoxo
Answer:
Jonathan can jog 3 miles in one hour. 3mph
Step-by-step explanation:
If he can jog one mile in 1/3 of an hour, all you would need to do is multiply his one mile by 3.
Answer:
20% of the invited people did not attend
Step-by-step explanation:
5 out of 25 people invited didn't attend Glen's party. That means the following:
people didn't come which simplifies to 
Multiply by the giant one 
so the denominator is 100 which is the denominator used to find percentages.
You end up with 
= 20%
