Decide if the following arguments are valid, using the given forms of valid arguments and fallacies. make sure you list the form that you used.
p → ∼q
∼q
∴ p
p-> ~q (premise)
~q (premise)
∴ p (conclusion)
what is the fallacy? i stated it was a fallacy of the inverse, but i am incorrect. can someone me out?

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z