Identify the constant rate of the change for each function

What is the value of x in the diagram below?

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each,and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent.how much did jame pay at the end?

What rotation was applied to triangle def to create d’e’f’?