book Maths Puzzle Numerical Ability

48(a+b)

48(a+b)(a-b)c:16(a+b)

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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 I have a nightmare problem. Can someone help show me how to both solve and check the answer? Thanks.

sqrt of - w + 113 - sqrt of w + 108 = -1
Where w is a real number