Can someone please help me with this

surface are is basically the area of all the shapes in the prism, so :

(2 x area of the triangles on the sides) + area of upper rectangle + area of bottom rectangle + area of side rectangle

(2x((1/2) x 12 x 5)) + (13 x 10) + (12 x 10) + (10 x 5)

question: how many people can she serve?

answer: she can serve 16.66666667 people. so she can only give 16 people a complete serving.

question: does she have enough ice cream for her guests?

answer: no. explanation: she only has enough for 16 people to have a full serving. however, she can give a 17th person a partial serving.