This is a combination problem. Order does not matter and the books are all different. You would write this as 21C5 or 
. Combinations are not fractions.
The answer is 
which = 20349 different ways these books can be chosen.
First you need to find the second base (b2) by plugging all the values into the area of a trapezoid formula.
A= 1/2 (b1+b2)h
After plugging it in you will find that b2= 21.3.
The questions is asking perimeter so you add all the sides together...
14.4+18.5+14.7+21.3= 68.9 ft
Hope it helps
34.12 thirty four=34 and=. twelve hundredths=.12
Answer: I can help
Step-by-step explanation:
1.333 the answer I hope help
