Can someone please help me with math.

Abag of popcorn contains 483 calories and servers 3.5 people. how many calories are in each serving.

Given the net of the rectangular prism, what is its surface area?

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30