Simplifying by using only positive exponents In your answer, gives Select one: Ob. O c. Od. 3:Which of the following expressions are equal? a. 3 -6 : (2+1) b. (6 - 4) : 2+1 C. (6 +8) :7-1 Select one: O a. Only (a) and (c) O b. Only (b) and (c) O c. All three expressions are equal. O d. Only (a) and (b)