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nevermind on that answer

is the answer 6x^3+7x^2y-16xy^2+10y^3

The Pythagoras's theorem is leg^2 +leg^2 = hyp^2

squares are two right triangles 

since we know a square is 5 on both sides, we can do

5^2 + 5^2 = hyp^2

25 +25 = hyp ^2

50 = hyp ^2

sq root of 50 = hyp

so the diagonal of the square is sq root of 50, and the sides are 5.

since the sq root of 50 is smaller than 9, and 5 is smaller than 9, we have proven that the square can fit in the circle 

Yes.

so i can multiply this

Expand the following:
(2 x + 5 y) (3 x^2 - 4 x y + 2 y^2)

(3 x^2 - 4 x y + 2 y^2) (2 x + 5 y) = 2 x (3 x^2 - 4 x y + 2 y^2) + 5 y (3 x^2 - 4 x y + 2 y^2):
2 x (3 x^2 - 4 x y + 2 y^2) + 5 y (3 x^2 - 4 x y + 2 y^2)

2 x (3 x^2 - 4 x y + 2 y^2) = 2 x×3 x^2 + 2 x (-4 x y) + 2 x×2 y^2:
2×3 x x^2 - 4×2 x x y + 2×2 x y^2 + 5 y (3 x^2 - 4 x y + 2 y^2)

2 x×3 x^2 = 2 x^(1 + 2)×3:
2×3 x^(1 + 2) - 4×2 x x y + 2×2 x y^2 + 5 y (3 x^2 - 4 x y + 2 y^2)

1 + 2 = 3:
2×3 x^3 - 4×2 x x y + 2×2 x y^2 + 5 y (3 x^2 - 4 x y + 2 y^2)

2×3 = 6:
6 x^3 - 4×2 x x y + 2×2 x y^2 + 5 y (3 x^2 - 4 x y + 2 y^2)

2 x (-4) x y = 2 x^2 (-4) y:
6 x^3 + -4×2 x^2 y + 2×2 x y^2 + 5 y (3 x^2 - 4 x y + 2 y^2)

2 (-4) = -8:
6 x^3 + -8 x^2 y + 2×2 x y^2 + 5 y (3 x^2 - 4 x y + 2 y^2)

2×2 = 4:
6 x^3 - 8 x^2 y + 4 x y^2 + 5 y (3 x^2 - 4 x y + 2 y^2)

5 y (3 x^2 - 4 x y + 2 y^2) = 5 y×3 x^2 + 5 y (-4 x y) + 5 y×2 y^2:
6 x^3 - 8 x^2 y + 4 x y^2 + 5×3 y x^2 - 4×5 y x y + 5×2 y y^2

5×3 = 15:
6 x^3 - 8 x^2 y + 4 x y^2 + 15 y x^2 - 4×5 y x y + 5×2 y y^2

5 y (-4) x y = 5 y^2 (-4) x:
6 x^3 - 8 x^2 y + 4 x y^2 + 15 y x^2 + -4×5 y^2 x + 5×2 y y^2

5 (-4) = -20:
6 x^3 - 8 x^2 y + 4 x y^2 + 15 y x^2 + -20 y^2 x + 5×2 y y^2

5 y×2 y^2 = 5 y^(1 + 2)×2:
6 x^3 - 8 x^2 y + 4 x y^2 + 15 y x^2 - 20 y^2 x + 5×2 y^(1 + 2)

1 + 2 = 3:
6 x^3 - 8 x^2 y + 4 x y^2 + 15 y x^2 - 20 y^2 x + 5×2 y^3

5×2 = 10:
6 x^3 - 8 x^2 y + 4 x y^2 + 15 y x^2 - 20 y^2 x + 10 y^3

Grouping like terms, 6 x^3 - 8 x^2 y + 4 x y^2 + 15 y x^2 - 20 y^2 x + 10 y^3 = 10 y^3 + (4 x y^2 - 20 x y^2) + (15 x^2 y - 8 x^2 y) + 6 x^3:
10 y^3 + (4 x y^2 - 20 x y^2) + (15 x^2 y - 8 x^2 y) + 6 x^3

4 (x y^2) - 20 (x y^2) = -16 (x y^2):
10 y^3 + -16 x y^2 + (15 x^2 y - 8 x^2 y) + 6 x^3

15 (x^2 y) - 8 (x^2 y) = 7 (x^2 y):
10y^3 - 16xy^2 + 7x^2y + 6x^3

A store's cost for a stereo was $27. The markup was 75%. A customer purchased it on sale at 40% the marked up price. What was the purchase price of the stereo?

$27 x 1.75 = $47.25 - The price of the stereo after 75% markup

$47.25 x [1 - 40%] =

$47,25 x [60%]      =

$47.25 x 60/100    =$28.35 - The purchase price of the stereo at 40% discount.

The graph looks like this: 

what did the rock say to the other rock? Nothing! rocks can't speak.