Given 3 and m are the roots of the quadratic equations 2x²+ kx - 15=0. FInd the values of k and m​

How do i get the answer for 2/3 * 10/3

Simplify the expression. -2/5(10+15m-20n)

(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.)