It is: (3x-4)(3x+4) is the difference of two squares
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53 when multiplied by itself gives 2809.
One square foot can be divided into four 6 inch squares. Multiplying the number of square feet by 4 gives an answer of 4,000 6 inch squares in an area of 1,000 square feet.
You do 128 divided by 160 and then multiply it by 100. You can cancel the fraction down (the fraction is 128/160) and this gives you 8/10 = 0.8 When multiplied by 100 this gives you 80 so it is 80%.
Starting with 7, every other multiple is odd.
The difference between the two is 179, since -45 + 45 equals 0 and added on to 134 gives you a total of 179.