help on math questions?

1. Eric paid $569.27 including tax for an LCD computer monitor. how much did the computer monitor itself cost

A. 605.61

B. 537.05

C. 536.05

D. 34.16

2. Factor. Check by multiplying 

3x^8 + 3x - 15

3x^8 + 3x - 15=

3.  solve for y 

5x + 12y = 4

4. Find slope-int. Equation for the line with indicated slope and y intercept

Slope -4/5 ; y-int. (0,4)  

A. y=-4/5x +4

B. y= -4/5x-4

C. y=4/5x+4

D. y=4/5x-4

Find the slope and y-int. If the line 

8x + 9y= 59

A. 1/8: (0, 9/50)

B. -8/9 (0, 50/9)

C. 8/9 (0, 50/9)

D. -1/8 (0, 9/50)

Perform the indicated operation. Write the answer  in scientific notation. 

10.92 x 10^5 / 2.6 x 10^-7

A. 4.2 x 10^12

B. 8.4 x 10^-2

C. 4.2 x 10^-2

D. 8.4 x 10^12

Subtract 

(9x + 7xy - 26y) - (29x - 19xy - 6y)

A. -20x + 26xy - 20y

B. -14xy

C. -20x - 26xy - 32y

D. 2x + 20xy +32 

Find the X and Y int for the equation 

 8y - 2x = -10

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