exam Maths Puzzle Numerical Ability

Solve for x

(1/7)^x=49

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exam Other Question

if z1,z2,z3, are the vertices of equilateral triangle then show that
z1^2+z2^2+z3^2=z1*z2+z2*z3+z3*z1
what property states that a=b is the same as b=a?
plz i need to know this for tomorrow... plz give me the answer fast... Im sorry for the inconvenience...