Sorry if this came too late.

Not sure if you were looking for an explanation or just the answer. Let me know if you want more details.
Z = 0.03 or 0.009/0.3
you just divide both sides by 0.03 to get z by itself
25 >= m
m is the money that Jack can spend.
when i put ">=" i meant greater than or equal to.
You have to distribute the minus sign to the second parenthesis, changing the sign of every term:

Answer:
Not enough information to answer. :(
Step-by-step explanation: