I don’t understand this at all

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom

(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.)

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?