Which types of reasons are not valid in a mathematical proof?
a. unproven theorems
b. postulates
c. definitions
d. already-proven theorems

There is 240 red cars and there is 400 blue cars because 240/3=80 and 80*5=400

Ithink so 1.you go to your profile and your questions and you'll be able to delete them

The heir to the austrian throne, archduke franz ferdinand was gunned down by a young serbian terrorist. germany urged austria to declare war on serbia. russia mobilized against austria, then germany mobilized against russia. france and britain mobilized against germany. then young men such as adolf hitler volunteered in the war.