Multiply: (5t – 4)(4t + 5) what is the product? 20t2 + 9t – 20 20t2 + 18t – 19 20t2 + 25t – 36 20t2 + 41t – 20

(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.)