The midpoint of XY is Z. If XY = 3n and XZ = n + 15, what is YZ?
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3 ×
expressing as a whole number, using the digits available, we obtain
3
Now consider the position of the decimal point in the original 0.003
To get it back to where it should be we require to move the decimal point 3 places to the left , denoted by a negative exponent
0.003 = 3 ×