the math club bought 16 graphing calculators for $765 The TI-70 model cost $40 and the TI-83 model costs $65 write a system of equations that could be used to determine the number of TI-70 calculator, x and the number of Ti-83 Calculators, Y,That were purchased

(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.)