A20-foot ladder is leaned against a wall. if the base of the ladder is 8 feet from the wall, how high up on the wall will the ladder reach? round the answer to the nearest tenth.

question options:

21.5 ft

18.3 ft

15.7 ft

19.1 ft

Step-by-step explanation:

we know that

Applying the Pythagoras theorem

see the attached figure to better understand the problem

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363