CAN ANYBODY HELP ME SOLVE THIS

Mr. bernard needs to order more boxes for his 16 inch diameter “super pizza.” use 3.14 to approximate π.

The probability that a tutor will see 0, 1, 2, 3, or 4 students is given below determine the probability distribution's missing value.

A120-inch strip of metal 12 inches wide is to be made into a small open trough by bending up two sides on the long side, at right angles to the base. the sides will be the same height, x. if the trough is to have a maximum volume, how many inches should be turned up on each side?