ABCD is a trapezoid with AD=5 ft, DC= 7 ft, and AB= 15 ft.
Find the area of the trapezoid.
33 ft2
4472
30 ft2
55 ft 2

(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.)