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:

oof

step-by-step explanation:

i got 86 for this

hope this !

if you need an explanation just ask