12:7
because you add 7 and 5 and then there is the 7 for the book weight
Answer: 
Step-by-step explanation:
The surface area of a rectangle can be calculated with:

The surface area of a trapezoid can be calculated with:

Calculate the area of the base, wich is a rectangle:

There are two equal rectangles, therefore, multiply the area of any of them by 2:

Calculate the area of the other rectangle:

There are two equal trapezoids, therefore, multiply the area of any of them by 2:

Therefore, the surface area will be the sum of all the areas calculated:

If this were to be put in this form:
the quotient we be on top, or another word the answer. I can't show it on here, but the answer is 165
Answer:
y....u.......p
Step-by-step explanation:
good day :D