Which of the binomials below is a factor of this trinomial?

x2 + 12x + 36

a. x + 4
b. x - 4
c. x - 6
d. x + 6

Use sigma notation to represent the following series for 9 terms.

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?

The angle of elevation from point a to the top of the cliff is 38 degrees. if point a is 80 feet from the base of the cliff , how high is the cliff ?