Solve the two-step equation and identify the steps. 1.4x + 6.1 = –7.9

1. The first step is to
on both sides.
2. The second step is to
on both sides.

The solution is x =
.

The random variable x has probability density function f (x) = k(−x²+5x−4) 1 ≤ x ≤ 4 or =0 1 show that k = 2/9 find 2 e(x), 3 the mode of x, 4 the cumulative distribution function f(x) for all x. 5 evaluate p(x ≤ 2.5). 6 deduce the value of the median and comment on the shape of the distribution.