The midpoint of AB is (-4, 7) and point Ais (1,8). What are the coordinates of the other endpoint, B? A (-9,6) B. (-7,22) c (-1.5.7.5) D (6,9)​

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

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?