How high did Abby climb above their original starting
position?

18 feet

Step-by-step explanation:

Abby climbed  18 feet from the original starting point

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can you put the picture up?

step-by-step explanation:

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c