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.
Ok so put the a factors together first
4a + 19 - 3a - 7 = a + 19 + 7
a + 19 + 7 = a + 26
Answer: I can't see the answers to answer the question but more importantly THIS IS A DIAGNOSTIC I CAN'T HELP YOU!!!!
Step-by-step explanation:
Answer: Altitude
Step-by-step explanation:
Altitude is perpendicular line made from vertex to side
Answer:
if the height is 5 then the answer is 1.2 but its possible i am wrong.
