Answer:
z=-3
Step-by-step explanation:
42 = -7z+21
-7z=21
z=-3
Let

be the width of the rectangle, so the length will be

.
Now, to find the perimeter of our rectangle, we are going to use the formula for the perimeter of a rectangle formula:

where

is the perimeter

is the width

is the length
We know that

and

, so lets replace those values in our formula:



We want <span>values of the width that will make the perimeter less than 96 feet, so lets set up our inequality:
</span>




<span>
Since the width can't be zero, we can conclude that the values </span>of the width that will make the perimeter less than 96 feet are:

or in interval notation: (0,18)
Yes the triangles are similar.
There is a common rate of dilation from the second triangle to the first. Each side can be multiplied/divided by three to find the other length.
I hope is helps.
I think it’s $1 for 2 pounds