Which of the following cannot be used as a reason in a proof?

a. definition
b. unproven theorem
c. postulate
d. proven theorem

Colby and jaquan are growing bacteria in an experiment in a laboratory. colby starts with 50 bacteria in his culture and the number of bacteria doubles every 2 hours. jaquan starts with 80 of a different type of bacteria that doubles every 3 hours. let x equal number of days. colbys experiment follows the model: a.) y=50*2^x b.) y=50*2^8x c.) y=50*2^12x jaquans experiment follows the model: a.)80*2^x b.)80*2^8x c.)80*2^12x

Which angle of rotation is an angle of rotational symmetry for all figures?

Acircle has a radius of 17. approximately what is the area of the circle