- MAth Help: a number divided by -3 is equal to -2.8?

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How would I sketch f(x,y) = x^2 + 9y^2 on the xy plane? I know it is a circle.? The odds against nolan getting promoted are 1:9 find the probability that nolan gets promoted? Find the quadratic function f(x)=ax^2+bx+c that goes through (3, 0) and has a local maximum at (0, 1) [Calculus]? Find the indicated probability.
μ = 4.6; σ = 2.2
P(3 ≤ x ≤ 6) (Show work? I'm so confused)? How many peaoyen in au?