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
-30 is the answer to your problem.
C. 40
30x30=900
40x40=1600
total of 2500 take the square root and your left with 50 so everything balances out