If n is a positive integer, then [42 -288 6 -42]^n is [ ___]
(Hint: Diagonalize the matrix [42 -288 6 -42] first. Note that your answer will be a formula that involves n. be careful with parentheses.)

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality