A 40-foot ladder is leaning against a wall. To use the ladder safely, the angle between the wall and the ladder must be no more than 15 degrees. A worker places the bottom of the ladder 12 feet from the wall, and begins to climb. is the worker safe?

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Which of the symbols correctly relates the two numbers below check all that apply 6? 6

Ammonia molecules have three hydrogen atoms and one nitrogen atom. how many of each atom arein five molecules of ammonia