What safety measures can employers use when workers are on a supported scaffold more than 10 feet above the working surface?

How do astronomers measure the amount of dark matter in the universe

A. describe the model of urban structure most often observed in mega-cities in developing countries. explain how this model differs from common urban structures in north america. b. describe at least two factors leading to the growth of mega-cities in developing or least-developed countries. c. identify and explain two factors that led to the formation of squatter settlements in mega-cities in developing countries.

Some studies have found that what percentage of students have cheated in some form? a. 10% b. 25% c. 45% d. 75%