Set up a proportion.
x 5
- = -
5.6 4
4x = 5(5.6)
4x = 28
4x 28
- = -
4 4
x = 7.
Did that help?
The answer is
-1 ≤ x < 3
We just learned this is in my algebra 2 AP class
Just remember that irrationals have to do with decimals; while rational numbers have to do with being completely whole numbers.
Answer:
She plays 5 new songs for every 2 old ones.
If she plays 15 new songs, she will play 6 old songs.
15 + 6 = 21
thus, she played 21 songs altogether.