Solve for x and y

Already solved for x if you can please go over it and correct me if wrong

Which of the following points is collinear with (-2,1) and (0,3)

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

(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.)