What is the value of r of the geometric series

.8

Step-by-step explanation:

The r value of the geometric series is what we multiply by each time.

We are multiplying by .8 each time so that would be r

The correct option is 1.

Step-by-step explanation:

The given geometric series is

It means the nth term of the given geometric series is

          .... (1)

The nth term of an geometric series is

          .... (2)

where, a is first term and r is common ratio.

From (1) and (2), we get

The value of r is 0.8. Therefore the correct option is 1.

is there any photos or whatever?

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.