The equation is 
The solved equation is 11
First, we must add 13 on both sides

The answer to the equation is 
The dog eats 6 cupcakes in 22 days.
<em>(don't know why a dog would be eating cupcakes in the first place, but sometimes math questions don't make the most sense)</em>
The answers would be pyramid and triangular prism.
32 as well according to some rule in geometry
2x-2y
I couldn’t tell if the first figure was a one or a L or i so I solved it as a 1