Simplify the expression: 3x + 5 (4y - 2x) + 12​

Can someone me with this? i’m not sure what to put for my equations.

What are the solutions of the equation x4 – 5x2 – 14 = 0? use factoring to solve. someone !

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.