Enter the value of x so that the expression (2.1b - 0.7) + (xb + 3.4) is equivalent to -3.9b + 2.7.

step-by-step explanation:

it will be a cylinder. with a diameter of 8 and 4 single pieces high

4444444444444 i think

∠cbe and ∠deb are same-side interior angles.

i took the test

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.