Answer:
x=6 y=-3
Step-by-step explanation:
Answer:

Step-by-step explanation:
The time constant of the isotope is:


The decay of the isotope is described by the following model:

Now, the time is cleared in the equation:



All significant digits...
Answer:
27y-45
Step-by-step explanation:
9(3y-5)=27y-45
12 and -4 or (x-12) (x+4)