If a ladder is 13 feet long and it is 7 feet away from the wall how long is the wall

Step-by-step explanation:

This is a classic right triangle problem using Pythagorean's Theorem. The ladder's length is the hypotenuse of the triangle and the length from the building to the base of the ladder is the length of the base of the right triangle.  We are looking for the height of the wall, which is also the height of the right triangle, which is also the missing leg in our formula:

and

and

so

y = 10.9 feet

there would be 365 different 4 digit numbers

step-by-step explanation:

i belive that it is 365 because i asked google

expression #3 is not equivalent. the others are.