6. c is less than or equal to 1 because a dollar is the maximum value, therefore everything else in the store has to be less. 7. If the population is at least a billion, it can only go up from there, therefore it is 1,000,000,000 is less than or equal to p
6. a dollar or less = $1 dollar or less than $1; therefore, <= sign is used
7. at least = the minimum of the number given; therefore, >= sign is used.
(if you are struggling with which sign is the "greater than" or "less than," remember that the bigger ones are what they are most likely to eat, for example, 100 > 1; imagine signs like Pacman eating those balls)
