Answer:
2.9 years
Step-by-step explanation:
Given that :
Half-life t1/2 = 9 years
Initial mass = I = 70 grams
A = final mass = 56 grams
t = time taken to reach final amount
Using the exponential half life relation :
A = I(0.5)^t/t1/2
56 = 70(0.5)^t/9
56/70 = 0.5^t/9
0.8 = 0.5^t/9
Log 0.8 = log 0.5^t/9
−0.096910 = −0.301029 * t/9
t/9 = 0.096910 / 0.301029
t/9 = 0.3219291
t = 0.3219291 * 9
t = 2.8973619
t = 2.9 years
It means <span>9 is not an element of T. hope it helped</span>
Answer:
2 1/4
Step-by-step explanation:
-11/2+7 3/4
-11/2 + 31/4
= 9/4
= 2 1/4
Usually it's fun when you know what's going on....
B. 4(6x) and 24x.
Hope this helps!
