during a 15-minute flash sale at a bookstore, 27 books were purchased for a total of $219.. new books cost $12, and used books cost $5. how many used books were sold?

step-by-step explanation:

yes it represnts a functio, their are not 2 of the same numbers on the both sides

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2

1.) 21

2.) 0.453

3.) 1.5

4.) 48

5.) $ 22

step-by-step explanation: