Answer:
1
5z + 6z = 11z
2
9y + -6y = 3y
3
ANSWER ( 11z + 3y)
3.7 n^2 + 4n + 2.1
Explanation:
2.7 n^2 + n^2 = 3.7 n^2
6n - 2n = 4n
7.8 - 5.7 = 2.1
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