Question

A 28 foot ladder leans up against a wall. How high up in the wall does the ladder reach if the foot is placed 8 feet from the bottom of the wall?

Answer 1

here we have to apply the theorem of Pitagora, namely the requested height is given by the subsequent formula:
\[\large h = \sqrt {{{28}^2} - {8^2}} = ...?\]

Answer 2

h=720

Answer 3

what is
\[\large \sqrt {720} = ...?\]

Answer 4

26.832

Answer 5

that's right!

Answer 6

yay!