Enter the number that belongs in the green box.

the answer is 12.8 because

both of these equations added together make a straight line, or 180 degrees

so we have to put them together: 7x+8x-12=180

and we just solve for x

in the math equation 8 x 7 = 56, the 8 and the 7 are both factors of 56, since in this lesson we will use square tiles to figure out the factors of a whole find as many different arrays as you can, but follow one important rule: all the rows must have the i can make two rows of nine, so 2 and 9 are both factors of 18.

step-by-step explanation: