Which equation supports the given conjecture?
the difference of two odd numbers is an even number.
a.23 – 19 = 4
b.16 – 10 = 6
c.17 – 12 = 5
d.3 + 5 = 8

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

(60 points) explain this in detail