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11 / 42 Mai
One-third of a number is 12.
Work out one-half of the number.

Step-by-step explanation:

Let the number = x

1/3 × x = 12

x = 12 × 3/1

x = 36

I HAVE SOLVED THAT MUCH I UNDERSTOOD

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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.

answer: the answer is b. i think hope i got it correct

step-by-step explanation: