$0. She got the $40 ring and then gave it back. 40-40=0.
Couldn’t quite read everything, the writing is very light. But from what I could read, it was correct for the most part. :)
Answer:
(-1,2.5)
Step-by-step explanation:
Diagonal of a cube formula: D=a√3 [a=side length]
D = 5√3 ≈ 8.7 cm.