Marcy and Gary head to the store to get school supplies for their math class. Macy purchases 3 notebooks and 4 binders which cost her $18. Gary purchased 6 notebooks amd 5 binders which cost him $27. Write a system of equations that could be used to model this situation

(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.)