A sample of Iron-59 contains 50 mg. One hundred days later, the sample contains 10.75 mg. What is the half-life of iron-59, in days? Round to the nearest tenth.

Step-by-step explanation:

We can use the decay equation:

But:

So, we can rewrite the initial equation:

Now, we just need to solve it for t(1/2):

I hope it helps you!

6, 10

9, -13

12, -21

18, -23

step-by-step explanation:

you just add 6 to the x-coordinate and subtract 10 from the y-coordinate.