5th Grade Math
posted by Alex .
Glenda bought z containers of laundry detergent at $9 each.
She gave the cashier $50.
a. Find the change Glenda received in terms of z.
b. If z = 3, how much change did Glenda receive?

well 509times z or = 509*z
so that is thhe change: 509z
if z=3,
change=5027=23 dollars 
a.
50  9z =
50  (9 * 3) = 23 
dont know don't understand