S=6a²
a=8mm
S = 6 * 8² = 6 * 64 = 384 mm²
Yes. 75 is in fact greater than .75
Well if it adds up to 89, and the difference is 25, wouldn't the number be 64? Because 25 + 64 = 89.
An example of two addition sentences where the sum is the zero might be
0+0=0 5+(-5)=0 In this example a negative plus a positive equals 0.