Mary mixes white paint with blue paint in the ratio 2: 3. she makes a total of 20 litres of paint . how much more paint will she need to add to the mixture so that the ratio of the white paint to blue paint will be 1: 7

Solve the system of equations. y= 2x y= x^2 - 15

(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 one is the correct answer, and why?