Answer:
19a.
2(s+7)≤30
say s stands for the money they need for snacks.
there are 2 friends who both pay $7 and whatever s is, so we put s+7 in parenthesis to evenly distribute it between them. it has to be less than or equal to $30 because that's the only money they have
19b.
2(s+7)= 2s+14
30-14=16, so the friends have 16 between them
16 divided by 2 is 8, so the equation would be
s≤8
