3) which sequence is modeled by the graph below?

coordinate plane showing the points (1, 2); (2, 2); (3, 2); (4, 2)

a) an = 2(n − 1)1

b) an = 2(1)n − 1

c) an = 2 + (1)n − 1

d) an = (2)(n − 1)

4) find the sum of the summation of 2 i minus 9, from i equals 3 to 10.

a) 52

b) 26

c) 13

d) 32