exam Maths Puzzle Numerical Ability

what is the domain of the logarithmic function f(x)= log(7-x)

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exam Other Question

Given f(x)= {2x-1 x<3
{-2 x>or=to3

Evaluate f(-1)
Evaluate f(3)
Evaluate f(5)

Thanks
If (1,y) is a solution to y+x>=5y+5, what is the value of y?

Answer Choices:

A) -4>y
B) -1>=y
C) y>=4
D) y<1