exam Maths Puzzle Numerical Ability

Solve: 63^x = 7.

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If g(x) is an inverse of f(x), then how do the ordinate and abscissa coordinates of the points on f(x) map onto coordinates of g(x)? please help me! i dont know how to do this...

find coordinates of for the centroid whose triangle verticies are (a,p) (b,q) and (c,r). then find the centroid for (-1,5) (-2,8) and (3,3)