A cube number is an integer which is a third power of another integer.
A triangular number is a number that counts the objects that can form equilateral triangle (sorry, I cribbed it a little from Wikipedia; it's difficult to explain). Just look at the picture. <span />
You take 7.25 (10)+5.5p=105.5 72.5+5.5p=105.5 To make the equation easier multiply the whole equation by ten like this (72.5+5.5p=105.5)10 that equals 725+55p=1055 Then subtract 725 to both sides 725+55p=1055 -725 -725 ____ _____ 55p=330 Then divide by 55 on both sides and that equals 6 so 6 people bought tickets