4. (01.02) The number of cars (c) in a parking lot increases when the parking fee () decreases. Write the correct equation for this scenario, and solve for the number of cars when the fee is $6.
Fee
20
30
Cars
15
10
(1 point)
Oc-
300
;C-50
o
C
300
-;C=50
O c = 3f;c - 18
O c = 3f; c = 2

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?