exam Maths Puzzle Numerical Ability

Hello,
How do i solve this equation:

3^x = 1/9

thank you!

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exam Other Question

I am having a problem understanding regression lines. One of my study questions is "use the equation of the regression line to predict y when x=20"
I am given a multiple choice answers of: 45.5, 50, 40 or 48.5.

Can somebody explain this to me? use a number line to find the sum of the numbers: 3 and 5