Idk how to do this!
a painter leans a 12 ft ladder against a building. the base of the ladder is 5 ft from the building. to the nearest foot, how high on the building does the ladder reach?

For this problem you must do Pythagorean theorem:

In this example 10ft is c and 7ft is a (or it could be b, and you'll be solving for a instead of b. It's the same thing, since a and b are both legs)

Plug what you know into the equation:

49 +b^{2} = 100

Bring 49 to the right side by subtracting it:

b^{2} = 51

Now you still must isolate b. The opposite of squaring is taking the square root so take the square root of both sides to cancel it from the left side:

b = 7.1414

b ≈ 7 ft

Hope this helped!

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1