- F(x) = 4x - 7; g(x) = x + 3 what is the value of (g•f)(4)?

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X and Y are random variables with joint PDF of x + y ≤ 1 for x ≥ 0 and y ≥ 0, and 0 otherwise. What is the marginal pdf fx(x) and fy(y)? Can anorexia cause acidity? Find all relative extrema of the function. f(x) = x2 + 6x + 12
I need relative maximum and relative minimum? I've got the first line, can't figure out the next step.? College algebra problem unsure asbout 8888.88 but need confirmation on the problem,, thanks?