About 6/8 of the earth's suface is covered by water. about what fraction of earth's surface is not covered by water?

The moats separating people from the animals are 5 m wide for lions and 4 m wide for the elephants. if the lion’s moat is 4 m deep, how deep should the elephants’ moat be?

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )

Given abc find the values of x and y. in your final answer, include all of your calculations.