Question

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Answer 1

g(x) is not a function. Its slope is undefined because it represents a vertical line.
f(x) has a slope of 200/40=5.

Answer 2

wait so is it a or b ?

Answer 3

Slopes cannot be compared when g(x) does not even have units.
Even f(x) does not have definite units (minutes, or hours). (page/min, or page/h...)
I would put (b).