New here...but could really use help please!!!

[Yevgeniy1990]

So I am way stuck on these problems....

7. [8 points] The half-life of iodine-123 is 13 hours. Suppose you begin with 100 grams of iodine.
a) Write the equation that gives the amount of iodine 123 after t hours.


Answer a): _________________________
b) Determine the number of hours needed for your sample to decay to 10 grams. Use logarithms to solve and show your work.





Answer b): ________________________
8. [9 points] The graph shown below is for the function . The quantities , , and represent fixed constants.

 

[tkhunny]

Have you been attending class? Reading your text?

Is this your homework or an exam?

You can NOT have NO idea or you simply should not be in this class. Seriously.

Please show your efforts on ANY problem. There must be SOMETHING you can show us.

 

[mmm4444bot]

These exercises cover a lot of material. Are they from a placement exam? A practice final?

We cannot teach you this material on these boards. We're here to guide students who have specific questions about their math or materials.

Please read the post titled "Read Before Posting" for information about what to post.

Thank you! :cool:


PS: The last sentence in exercise 2(a) appears cut-off.