5friend's are having a tennis tournament. each friend will play the other 4 friend once. how many matches will be played

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

Divide. write in simplest form 41/6 divided by 10

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236