Alg.2 Homework.. Can you check these answers and help with the ones that are blank

Factoring Special Products

1. 9x^2 - y^2 (3x+y)(3x-y)
2. 16a^2 - 4b^2
3. 1 - 4y^2
4. a^2 - c^2 (a+c)(a-c)
5. x^6 - 36 (x^3+6)(x^3-6)
6. a^2b^2 - d^2 (ab+d)(ab-d)
7. 9x^4y^2 - z^6 (3x^2y+z^3)(3x^2y-z^3)
8. 36x^2y^6 - 16 (18xy^3+2)(2xy^3-8)
9. 0.09y^2 - 0.81
10. 1 - 100x^2
11. 36a^2x - b^2 (6a^x+b)(6a^x-b)
12. 9x^2 -16

Thank you(:
P.S. Do NOT leave rude or smartass answers.

They are examples of a squared expression subtracted from another squared expression, otherwise known as the difference of squares. Easy to factor: p² - q² = (p + q)(p - q)

16a² = (4a)² and 4b² = (2b)², so 16a² - 4b² is the difference of squares.
16a² - 4b² = (4a + 2b)(4a - 2b)

Please put up one or two questions at a time. People (including me) avoid answering such amount of questions at once.