MEDAL AWARDED!
2. A sample of radioactive material has been decaying for 5 years. Three years ago( at 2 years), there were 6.0 grams of material left. Now (at 5 years), there are 5.2 grams of material left.

a. Write two point from this problem: _________ and _________
b. Using point-ratio form, y=y1b^x-x1, plug in the two points and solve for the ratio, b. Show all steps
c.Write an exponential equation in point-ratio form for this situation
D.Define your variables (include units)

Question

MEDAL AWARDED!
2. A sample of radioactive material has been decaying for 5 years. Three years ago( at 2 years), there were 6.0 grams of material left. Now (at 5 years), there are 5.2 grams of material left.

a. Write two point from this problem: _________ and _________
b. Using point-ratio form, y=y1b^x-x1, plug in the two points and solve for the ratio, b. Show all steps
c.Write an exponential equation in point-ratio form for this situation 
D.Define your variables (include units)

anonymous · Answer

e. Use your equation to determine how much material will be left after 50 years from the beginning so x=50
f. what is the half-life of this material? That means when will there be half the original amount?

anonymous · Answer

a. two points are (2, 6.0) and (5,5.2) 
b.6.0=5.2^5-2
c?
D?
and from there i'm just lost on e and f