Three terms of an arithmetic sequence are shown below. which recursive formula defines the sequence? : f(1) = 6, f(4) = 12, f(7) = 18

a. f (n + 1) = f(n) + 6

b. f (n + 1) = 2f(n)

c. f (n + 1) = f(n) + 2

d. f (n + 1) = 1.5f(n)

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

What is the number 321,000,000 in scientific notation? also what is the number? ?

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3