How do i do this its systems of equations

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

(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.)