3(7x+4) very confused hel

21x + 12

Step-by-step explanation:

Distribute

3(7x) = 21x 3(4) = 12

21x + 12

So that’s the answer cuz like terms cannot b combined with numbers

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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.

step-by-step explanation:

its 512 because parenthesis and to the 2nd power is 512 so it will be 512