c is 0 on the right and -1 on the left Hope this helps.
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Answer:
3x²y+0.5y+1
Step-by-step explanation:
2+3x²y -0.5y+y -1
2 and -1 is 1
-0.5y and +y is +0.5y so the answer is...
Percent change is
(New - old) / old
50 - 75 / 75
25 / 75 = .33333333....
To convert to a percent, multiply by 100
Percent decrease = 33.33%