if y is directly proportional to x, and y = 10 when x = 2.5 determine the value of : the constant of proportion, x when y = 20 and y when x = 1.25

Place the following steps in order to complete the square and solve the quadratic equation,

The function below show how much jayna and hannah charge for babysitting. which statement best compares the two plants?

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?