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Three digits in an area code.
d=3c
It means she wants the D
If you mean a ; (-5,4) & b ; (3,-2) If you mean that they are the (x,y) coordinates, then please write them in brackets separated by a comma. If this is what you mean, then we use Pythagoras. d^2 = a^2 + b^2 Substituting d^2 = (-5-3)^2 + ( 4 - - 2)^2 d^2 = (-8)^2 + (6)^2 d^2 = 64 + 36 d^2 = 100 d = sqrt(100) = 10 is the distance between the two points.
!f you mean d/dx (1 + x-2) = -2x-3 If you mean d/dx (1 + x)-2 = -2(1 + x)-3