S9: {2, -4, 8, . . .} *

684.

Step-by-step explanation:

-4/ 2 = -2 and 8 / -4 = -2 so:

this is a geometric sequence with a = 2 and r = -2.

Sn = sum of n terms =a * (1 - r^n) / ( 1 - r)

So when n = 9:

S9 = 2 (1 - (-2)^9) / (1 - (-2))

= 2 * 1026 / 3

=  684.

the one on the bottom left

step-by-step explanation:

all of the other ones have a specific pattern

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.