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First find the difference between the numbers. Do this by subtracting the first number from the second number...

18

-7

11

Double check this to see if this runs true for ...

x^2+12x-45

x^2+15x-3x-45 (15x - 3x= 12x and 15 x -3=-45)

x(x+15)-3(x+15)

(x-3)(x+15) 

My patio has an area of 68 m , so 48m².
Each tile has an area of 0.50.5 m, so 0.25m².
To find the number of tiles we need, we divide the area of the patio by the...

Number of thirds in 1 = 3

Number of thirds in 9 = (number of thirds in 1) * 9 = 27 thirds

7/12 + 1/12 = 8/12

8/12 can be simplified to 2/3

therefore the answer is 2/3 as this is the most simplified version of the fraction 8/12