Answer:
4.62 hrs
Step-by-step explanation: there is 1g of pb-209 present and it's half life (time to reduce to it's half value) is 3.3 hours.
Half of the original value = 1g/2
= 0.5g
So
0.5g = 3.3 hrs
Now 70% of 1g is 0.7g
Value of pb-209 remaining at 70% removed is 1-0.7=0.3g
So the Time to decay to 0.3g is
=(0.7*3.3)/0.5
=2.31/0.5
= 4.62 hrs
In order to solve this equation, isolate the variable to find its value
X is 2
one 10$ bill
1×10$ = 10$
10× 1$ = 10$
a^2+b^2=c^2
Step-by-step explanation:
a, b, c each represent a side. Lets say a triangle has a=2 and b=4.
b^2= 4^2= 4*4= 16
2. a^2+ b^2= 4+16= 20= c^2
<u><em>Get it?</em></u>