exam Maths Puzzle Numerical Ability

what values are excluded from the domain of the function
a)f(x)=5x+1
b)g(x)=x-4y=8

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exam Other Question

Find the mean.

-9,-7,3,5,6,20 need to find the domain of and how it was obtaned
f(t)=4.5^t
g(x)=log(x+3)
g(x) = 2^x
g(t)= 1n(t-1)