Answer plz and d. is 1,962 2/3 pi m3

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)

Is (root2 -2)^2 rational or irrational. show the steps and answer fast