100-33.33= 66.67 (about 2\3-- --basicly it is)
Answer:
20,000 particles
Step-by-step explanation:
Here we are given that the amount if radioactive particles has come down to 40,000 from 80,000 in 80 years . Hence by the definition of Half Life,the half life of the item is 80 years.
Now we are asked to guess the number of radioactive particles after 80 years. As we already know that , the half life of material is 80 years , the number of radioactive particles will be reduced to its half in 80 years. Hence the number of radioactive particles after 80 years is 20,000
Answer:
SAS because they gave you a side and angle and another side.
B, D and F are midpoints
so
DB = 1/2 (AE)
BF = 1/2 (CE)
DF = 1/2(AC)
in this case you only need to find out DF = ?
and you also know AC = 50
so
DF = 1/2 (AC)
DF = 1/2(50)
DF = 25
answer
DF = 25
Answer:
1. 120 2. 45 3. 13 4. 492 5. 0.88
Step-by-step explanation:
1. set it up as a ratio 30m/3g=x/12g, cross multiply
3x=360 solve for x
x=120m
2. set it up as a ratio $40/8h=x/9h, cross multiply
8x=360 solve for x
x=$45
3. set it up as a ratio $32.5/5t=x/2t, cross multiply
5x=65 solve for x
x=$13
4. set it up as a ratio 738k/6m=x/4m, cross multiply
6x=2952 solve for x
x=492k
5. set it up as a ratio $0.32/4m=x/11m, cross multiply
4x=3.52
x=$0.88
hope this helps!
