1. write the nth term of the following sequence in terms of the first term of the sequence.
10, 20, 40, . .
2.write the nth term of the following sequence in terms of the first term of the sequence.
2, -4, 8, -16, . .
3. write the nth term of the following sequence in terms of the first term of the sequence.
a, a + 4, a + 8, . .

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.