Suppose that three random variable X1, X2, and X3 have a continuous joint distribution function with the following joint probability density function:f(x1; x2; x3) = c(x1 + 2x2 + 3x3) for 0 xi 1(i = 1; 2; 3); (2) otherwise it is 0. 1. Determine the value of constant c,
2. Determine the marginal joint probability density distribution of X2 and X3

Alake near the arctic circle is covered by a 222-meter-thick sheet of ice during the cold winter months. when spring arrives, the warm air gradually melts the ice, causing its thickness to decrease at a constant rate. after 333 weeks, the sheet is only 1.251.251, point, 25 meters thick. let s(t)s(t)s, left parenthesis, t, right parenthesis denote the ice sheet's thickness sss (measured in meters) as a function of time ttt (measured in weeks).

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)