Please help in math!! (Question in picture) (question 1 and 2 please)

Hey there mate :)

As per question,

Given that Nicole made:-

And she packed:-

1. The number of boxes can be obtained as the quotient when 5x^3-13x^2-20x+800 divided by x-5.

(The division part is attached as image. Check it)

Thus the number of boxes is 5x^2+12x+40

2) The number of cupcakes left unpacked is equal to the remainder when 5x^3-13x^2-20x+800 divided by x-5.

Thus, the number of cakes left and unpacked is 1000