A rational number is any number that can be represented as a fraction. (7=7/1 or 52 = 26/1 ).
An irrational number is a number like 3.14159 (pi) or anything like that.
Answer:
The exact value is 2.41421
Sarah got £48, Liam got £32, and Emily got £112
10y-50=-20
10y=30 (I added 50 to -50, then added 50 to -20)
y=3 (I divided 10y by 10 to get y then divided 30 by 10)
Reply to this with any questions or if you need more clarification and I would be more than happy to help.