Answer:
Step-by-step explanation:
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Hope I was able to help :-)
Answer:
Sally would have 8 diamonds left
Answer: y=0,5x²-x-1,5.
Step-by-step explanation:

We summarize (1) and (3):

Substitute b=-1 into (2):

From (5) subtract (4):

Substitute a=0,5 into (4):

Hense:
y=0,5x²-x-1,5.
M= 276 31+276=307.
307-31=276 that’s how I found M