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
Answer:
-8p-14
Step-by-step explanation:
If their call lasts 11 minutes the cost will be the same
To answer that question, you need to multiply 35 minutes × 240 days.
So:
35
× 240
_________
8400 minutes,
So Jodi walked a total of 8400 minutes
I hope this helped :)
Answer:
B. y=-x – 7
Step-by-step explanation:
Hope this helps!
