- Wht is the value of 3^-2?

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If a number is divisible by 5 how do you know it will be divisible by 15? What components of the atom is found outside the nucleus? The two points on the line 2x + 3y + 4 = 0 which area at a distance 2 from the line 3x +? How does the double cross magic pen by Mark southworth work? Thanks.? Why does a number need to be divisible by 5 and 3 in order for it to be divisible by 15?