please help i'm stup_id I can't do anything. When you give the answer, please tell how you did it so i can learn

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.)

The graph of y=x3 is transformed as shown in the graph below. which equation represents the transformed function?

Find the area of the surface obtained by rotating the curve z=4e^2y from y = 0 to y =1 about the y-axis. the area is square units