exam Maths Puzzle Numerical Ability

What is the y-intercept of -1/6(y+3)=(1/2)^x-3?

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exam Other Question

Solve to four decimal places:log(4) (x-9)=2.

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Trying to find the greatest possible error and the percent error for each measurement. 3 cm. or 16 in. I transfered 2 days ago and they are further than my old school. Thanks