**How much help to give?**
I'm new to these forums, so please forgive me if I'm giving too much information. Also, my answers could be wrong.

For part A, they want you to solve for k in the equation k=.132B/W. They give you the values for B and W. As Eliz. said, you just need to plug those numbers in to solve it.

So your equation becomes:

k = (.132 * 2.64m^3) / 75kg

Just plug that into a calculator and you get 2.64m^3 / 75kg

Finally you get .0352 cubic meters per kg as the value of k.

For part B, they want you to plug the k value into the R = kd equation, and they give you the value for d.

Again, you just need to plug those numbers in to solve it.

R = .0352 m3/kg * .42 ppm

R = 0.0148 excess lifetime cancer risk

Part C is the most difficult, and I may be missing something.

I took the excess lifetime cancer risk (R)

Figured it out for 5000 people:

1.48% of 5000 = 0.0148 * 5000 = 74

Which should yield the number of people that will die of cancer over a standard lifetime from the group chosen.

Since they gave the standard lifetime as 72, I divided 72 into 74 and got 1.027777 or 1.03 people who would die each year.

-AK