Which of the equations are true identities? \begin{aligned} \text{A. }&m^3-1=(m-1)(1+m+m^2) \text{B. }&(n+3)^2+2n=8n+13 \end{aligned} A. B. m 3 −1=(m−1)(1+m+m 2 ) (n+3) 2 +2n=8n+13

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)