What is the closed linear form for this sequence given a1 = 13 and an + 1 = an + 4? A)an = 9 + 4n
B)an = 9 - 4n
C)an = 13 + 4n
D)an = 13 + 4n - 1

Use the inverse of the function y=x^2-18x to find the unknown value [tex]y = \sqrt{bx + c \: + d} [/tex]

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

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?