Here is my friendly solution i'll skip the proof part for now. I am working on the others.
Answer:
The answer is 25 and -25 :)
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A)
= 3 2/4
= 3 1/2
b)
= 7 10/15 + 2 3/15
= 9 13/15
Since addition is commutative, she can add anyway she wants.
(17+51)+(10+13)
(51+10)+(17+13)
Hope this helps.
The answer is 4500 because 3 is less than 5 so we dont have to add one to five