For each order pair ,determine whether is it a solution to 7x+4y=-23

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

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?