12/(5x-2)=(12+4)/6x
72x=80x-32
8x=32
x=4
1.92 / 0.08 = 24.....Karina bought 24 erasers
Answer:
Step-by-step explanation:
α + β = -b/a
αβ = c/a
α² + β² = (α + β)² - 2αβ
To find the answer, we need to see by how much 20 changed to 30.
20 (1.5) = 30
So that means that
9 (1.5) = 13.5