Answer:
6
Step-by-step explanation:
you add them all up and divide it by how many numbers there are
4x+27
---- ----
4 4
x=6.75 or x=7
a_n=a_{n-1}-9
Steps to solve:
3x * (7 * x)
~Simplify
3x * 7x
~Combine like terms
21x
Best of Luck!
Substitute the value of b = -2 to the expression