After swimming 80 feet below the surface of the water, a whale swims up 40 feet. Use the number line to help you create an equation that shows the new location of the whale in relation to the water's surface. Interpret the sum in the context of the problem. PLS HELP I REALLY NEED THIS ANSWER A. S.A. P

(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.)