Planet Earth has a mass of 1726 * 10 ^ 24 kilograms. And although 70% of the Earth's surface is made of water, the water's mass is only 5 * 10 ^ - 4 percent of the Earth's total massUse scientific notation to estimate the mass of the plane water In your final answer include all of your estimates and calculations .

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?