Help me please also can u please answer these:

2. If a red-tailed boa, a Western Hemisphere constrictor snake, grows from 22 inches at 2 months of age to 42 inches at 1 year of age, what is its average growth?

3. An orchard has enough space to plant 21 rows with (y) trees in each row, or 18 rows with (y) + 7 trees in each row. If each orchard plant contains the same number of trees, how many trees can each orchard contain?

pleas help me out here.. I have no clue how to do this whatsoever.
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1 Answer

Hints:

1)

3xy^2(x+y-2x^2y^4)

2)

44/22=1.9 = 90%

(90/10)*12108%

3)

21(y)=18(y+7) => solve for y=42

total =21y = 882

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