Find the value of each variable that makes the equation true. a. 2^5 x 2^3 = 2^a

b. 7^4/7^b = 7^-2

c. 8^c = 1/64

Which phrase best describes the word definition in an axiomatic system? a. the accepted meaning of a term b. the statement of an axiom c. an accepted fact that is not proven d. a fact proven by using logic