15 foot ladder is leaning against a wall if the base of the ladder is 5 feet from the wall how high up the wall the ladder reach?

This is a good example of which Pythagoras's theorem could be used on.
The theorem states: a^2 + b^2 = c^2

If we subsitute the values into the question we get this:
a^2 + 5^2 = 15^2

Simplfy:
a^2 + 25 = 125

Then inverse:
125 - 25 = a^2

Answer it:
100 = a^2

Square root it:
10 = a

The answer is 10 feet
Hope it helped :)

45 this is because of the agarose

Iam not sure but i think the answer is b