Question

A 12-foot ladder is leaning against a wall. The bottom of the ladder is 5 feet away from the bottom of the wall.


Approximately how high up the wall does the top of the ladder reach?

A.
2.4 feet

B.
7.0 feet

C.
13.0 feet

D.
10.9 feet

Answer 1

use the Pythagoras theorem

12^2 = 5^2 + x^2

solve for x

Answer 2

so B

Answer 3

@paki

Answer 4

x^2 = 12^2 - 5^2

can you work that out
use your calculator

Answer 5

12-5 = 7 so B