What is the value of (–7 + 3i) – (2 – 6i)

(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.)

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?