<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>
I think that there are 33 left.
I hope this helps you!
500 = 200 + 2.50x
x = amount of dessert baskets
500 - 200 = 300.
300 = 2.50x
300 ÷ 2.50 = 120.
Casey made 120 dessert baskets.
Answer:
448
Step-by-step explanation:
320/5 is 64 miles per hour
64*7 is 448
she will travel 448 miles in 7 hours
Answer:
3/8 is less than 11/12
Step-by-step explanation:
3/8 is 0.375 as a decimal
11/12 is 0.92 as a decimal
so 3/8 is less than 11/12
It always helps to turn them into decimals...
