exam Maths Puzzle Numerical Ability

Please help w/ the following:

e^-3x=3.1

Thank you.

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exam Other Question

I have a log question... I am having a hard time setting up this problem... please help me..

log 25=x
5

and

log (5)^-2
5

can you please help me thank you..... find (a)f o g (b)g o f .find the domain of each function and each composite funcition.

Given: f(x)= x^2 +1 g(x)=square root of x

i can find f(g) and g(f) but i cant find the domains