exam Maths Puzzle Numerical Ability

find the domain of the following

f(t)=4.5e^t

show work or explain how

g(x)=log(x-3)

show work or explain how

g(x)=2^x
show work or explain how

g(t)=ln(t-1)
show

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exam Other Question

The question is
Slope: 5; y-intercept: (0, -2)
I believe to figure the answer I would use:
y=5x-2
and the coordinants would be
(5,0)
(0,-2)

I am completely confused. Any help you can give would be great
I have been helping my son with his homework and I myself need help w/ this problem.

Points X,Y, and Z are collinear, w/ point X between points Y and Z. If XY = 14.8 and YZ = 18.2, find XZ.


Thank you for the help.

Angela