exam Maths Puzzle Numerical Ability

please help me solve g(-10)

if
g(x)=70

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exam Other Question

Solve the problem. A boat can go 33 mph in still water. It takes as long to go 300 miles upstream as it does to go downstream 360 miles. How fast is the current? Express as a log:

17^(x+2)=3a^(x-1)

please show working
thank you