If you mean similar as same ratio, the ratio for length to width is 2:1. the width would be 3 inches.
finding the perimeter of rectangles is basically 2L + 2W so the perimeter is 18 inches
The standard form equation of the line connecting the two points is 
Linear equation in a standard form is given as 
where,
A, B, and C are constants or numbers
x and y are the variables.
To solve this problem, the following steps would be taken:
Step 1: Find the slope of the line connecting points (-3,4) and (2,-6)

where,

Substitute

Step 2: Find the y-intercept (b) of the line by substituting
and
into
(slope-intercept form)

Step 3: Write the equation of the line in slope-intercept form by substituting
and
into 

Step 4: Rewrite the equation in standard form 

Add
to both sides

The standard form equation of the points (-3,4) and (2,-6) is 
Learn more about standard form of two points of a linear equation here:
brainly.com/question/18446164
The answer to your question is [0, <span>∞)</span>
See the attached picture to better understand the problem
we know that
in the right triangle ABC
cos 70=adjacent side angle 70/hypotenuse
adjacent side angle 70=BC----> <span>distance between the ladder and the tree trunk
hypotenuse=AC------> 15 ft
cos 70=BC/AC-------> solve for BC
BC=AC*cos 70------> BC=15*cos 70-----> BC=5.13 ft
the answer isthe </span>
distance between the ladder and the tree is 5.13 ft<span>
</span>
Answer:
The other answer I saw is the same way that I used to explain in my class as well. But, there's an alternative way to reach the answer as well
First thing that we should know is that if there are 'n' units kept in a row, then there are 'n+1' gaps generated by them. So, what we should understand is that when there is no item there is 1 gap, when there is one item there are 2 gaps, and so on.
Let us use that concept here, with a small variation: the 5 shelves are 5 initial gaps. The first book has 5 choices (5 initial gaps) to go to. Once we have placed this book, there are now 6 gaps on which the 2nd book can be placed. After the 2nd book is placed, there are 7 gaps in which 3rd book can be placed, and so on.
So, the total arrangements will be = 5*6*7*...24 [as there are 20 books] = 24P20