Need help please find all three answers

The sum of two numbers is 86, and their difference is 20. find the two numbers

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1

(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.)