Types of radioactive decay

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

Draw the structure for 5-isopropyl-2-methyl-3-nonene