At cooper high school, jazz band is only offered as a zero-hour (before school) class. dan has a zero-hour class. conjecture: dan is in jazz band. use deductive reasoning to verify the conjecture, or provide a counterexample if the conjecture is false. a. true; law of detachment b. true; law of syllogism c. false; dan may be enrolled in a different zero-hour class d. false; dan can never be in jazz band

I would say this is false because Dan may be in another zero hour class.

C.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.