2,1,6,13,22a)find the next two number of list. b)determine an algebraic expression from the given list of the number. c)find the sum of the first 70 numbers in the list.

a = 11 : 4

b = 38

c = 1 for every 6

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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.