Answer:
<em>M(13)=14.3 gram</em>
Step-by-step explanation:
<u>Exponential Decay Function</u>
The exponential function is used to model natural decaying processes, where the change is proportional to the actual quantity.
An exponential decaying function is expressed as:

Where:
C(t) is the actual value of the function at time t
Co is the initial value of C at t=0
r is the decaying rate, expressed in decimal
The element has an initial mass of Mo=970 grams, the decaying rate is r=27.7% = 0.277 per minute.
The equation of the model is:


Operating:

After t=13 minutes the remaining mass is:

Calculating:
M(13)=14.3 gram
0.76 19 divided by 27= 0.76
A. x^2 = 15^2 - 9^2
Here's why:
c^2 = a^2 + b^2
from the question:
15^2 = 9^2 + x^2
15^2 - 9^2 = x^2 which is similar to answer in A.
Answer:
Neither
Step-by-step explanation: