Priya is simplifying the expression 2(4-2.0)-3-2.7. Here is her work:
2(4-21)-3-2.1
8 -- 2.23-22
- 11-4.2
a. Priya's work is incorrect. Explain the error she made.
b. Write an expression equivalent to - 4(2+ 3) -12.3 – 5 that only has two terms.

I really only need B.

(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.)