Answer:
13.5 mg
Step-by-step explanation:
Here given Cobalt isotope has half life of 5.3 years.
Initial amount is 50 mg.
Given time(10 years) is roughly equals to two half life.
So, after 5.3 year 25 mg of isotope will left further in next half life only around 12.5 mg remains.
Among options 13.5 mg is the best possible
Answer:
here
Step-by-step explanation:
here
u can see in pictures
Answer:
80% = 640 and 90% = 720
Step-by-step explanation:
if the highest score is 800
then the 80% score should be
80/100 * 800 = 80 * 8 = 640
so the 80% score is 640
while the 90% score is
90/100 * 800 = 90 * 8 = 720
Answer:
10.75
-5/4
2 7/24
Step-by-step explanation:
1.)
__+-3.5=7.25
Let missing number = x
x - 3.5 = 7.25
x = 7.25 +3.5
x = 10.75
2.)
-3/4-__=1/2
Let missing number = x
-3/4 - x = 1/2
-3/4 - 1/2 = x
(-3 - 2) / 4 = x
-5/4 = x
3.)
-2 3/8-(-4 2/3) = x
-2 3/8 + 4 2/3 = x
-19/8 + 14/3 = x
(-57 + 112) / 24 = x
55 / 24 = x
2 7/24