An item is regularly priced at $72. dan bought it at a discount of 20% off regular price.

 $57.60

Step-by-step explanation: The formula for discount price is:

72-(72*.20) = 57.60

However you can factor out the 72:

72(1.0-0.20)=57.60 the answer would then just be 72(.80) = 57.60

If you need to do it quickly just think "if i took 20% off of 100% i'm left with 80% so this item costs 80% of the regular price"

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540