Answer:
4x^4y + 20x^2y^2 - 28x^3y
Step-by-step explanation:
4xy(x^3 + 5xy - 7x^2)
= 4xyx^3 + 4xy * 5xy - 4xy * 7x^2
= 4x^2y + 4xy * 5xy - 4xy * 7x^2
= 4x^4y + 20x^2y^2 - 4xy * 7x^2
= 4x^4y + 20x^2y^2 - 28x^3y
A room with no doors or windows is a mushroom
Answer: (∞, 0) ∪ (0, 2/5)
In other words, x is less than 2/5 but cannot include 0
<u>Step-by-step explanation:</u>

Answer:
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