This is another good example of a "participation homework." It has two cogent questions, put some comments.

Questions:

1. In order to do the first part of the homework I assumed that the equations introduced in Sub module 8a are applicable to RfD and RfC, is this correct? Can inhalation and oral ingestion be treated the same as far as HQ?

Yes, they are added.

2. For the significant figures of the HQ you say they are not expressed greater than whole number precision, but isn’t it more accurate to say one significant figure since most RfD, RfC, and HQ’s are smaller than one.

Yes, one significant figure.

Comments:

1. In question 6 in the homework you as if a UF of ten is used for extrapolation from animals to humans, but on the IRIS website the UF of 10 is for the protection of sensitive individuals, I guessed that they has sufficient human data, but in truth the amount of human data was never addressed in the write up of Ammonia. This makes the question very confusing

They discussed the human data.

2. In Question 7 you have section II.4.C written, but it is II.C.4.
3. Another nitpicky thing… The title of the article is “Nev. Town Baffled by Child Cancer”. (unless I read the wrong one)Yup