book Maths Puzzle Numerical Ability

Hello,

I need help with a few problems i cant seem to work out for homework.

1:Solve for x: 9^x=3
2:Solve for x: 2^9x^-4=32
3:Solve for x: log10^7=log10x-log10^2


Thanks

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book Other Question
my questions is
solve m+9.35=2.73

my answer is m=-6.62
thanks for the help Give the coordinates of the vertex.

7) y = (x - 2)^2


A) ( -2, 0)


B) (0, -2)




C) (0, 2)


D) ( 2, 0)