Me with these i don’t understand!

First exercise:

Let's call the initial weight of the dog . We know that after the first year the difference is -1.56 pound, so the weight after one year is

After another year, the new weight is But we know the way to express in terms of , so we have

Second exercise:

You need an equation to be satisfied when . Actually, this is already an equation, so we can simply rearrange it to get , which is an equation with solution 26.

Third exercise:

Rearrange the left hand side to get

Since 8 appears in both sides, we can simplify it:

Add 0.3 to both sides:

i’m here for points.

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.