math help please anybody!!!!!?

Question

1. d+2/ 6 - d-4/15
A. d-6/15
B. d+6/10
C. d-6/10
D. d+6/15

2. 6x^3y - 9x^2y^2 + 3x^2y
A. 2x^2y(3x-3y+1)
B. (2x^2y - 3x)^2
C. 3x^2y(2x - 3y +1)
D. prime

3. 16a^4 - 81b^4
A.2(4a^2 + 9b^2)(2a - 3b)
B.2(4a^2 + 9b^2)(2a + 3b)
C.(4a^2 + 9b^2)(2a + 3b)(2a - 3n)
D. prime

THANKS!!

Answer 1

B, C, C
But change the n to a b in the last answer.

Answer 2

1. d + 2/6 - d - 4/15

First: combine "like" terms...

d - d + 2/6 - 4/15
= 1/15

*I think you wrote the problem incorrect, please check your book.

2. 6x^3y - 9x^2y^2 + 3x^2y

First: find the least common factor which is "3x^2y" & multiply the LCD by the missing terms...

3x^2y(2x - 3y + 1)

3. 16a^4 - 81b^4

First: write the expression in lowest terms...

(4a^2)(4a^2) - (9b^2)(9b^2)

(4a^2 - 9b^2)(4a^2 + 9b^2)

Sec: factor the first set of parenthesis....

(2a + 3b)(2a - 3b)(4a^2 + 9b^2)

Answer 3

Two general hints that will help you progress in this field:

1. Listen in your class, take notes, understand it then do your own homework.

2. The subject is called mathS because it is short for mathematicS. It means 'that of which is yet to be discovered' and is therefore plural. If you take note of this particular point, you might even pass your English exam!

Answer 4

1) B
2) C
3) C

By the way in question 2, option C should be changed to

3x^2 (2x - 3y +1)y

as even though the C is still the correct answer, it would be futher factored if you put it the way I showed above.

Answer 5

Look in the back of the book, cheater...

Answer 6

I am terrible when it comes to math so i have no idea but you should probably ask someone who is smart

Answer 7

ok.

Answer 8

. . .

No thanks. Do your own homework, or you will fail.