Step-by-step explanation:

Answer: 40 books
Step-by-step explanation: 20%=8 Books
100 divided by 20 = 5
8 x 5 = 40
55 times. All you needed to do was multiply 13 by 4 and then add three.
Answer:
1. velocity
Step-by-step explanation:
that is the answer above
<h3>
<u>Required</u><u> Answer</u><u>:</u><u>-</u></h3>
This is an right angle ∆ and the side lengths containing a right angle are 9 and 11.
By Pythagoras theoram,

where p is the perpendicular, b is the base and h is the hypotenuse.
Plugging the values,

Then,


<h3>
<u>Hence:</u><u>-</u></h3>
The x of the right angled ∆ = <u>1</u><u>4</u><u>.</u><u>1</u><u>2</u>