20 pts examine the diagram. transversal n intersects lines l and m to form 8 angles. the angles formed with line l, clockwise from top left are 63 degrees, (15 x minus 3) degrees, blank, blank. the angles formed with line m, clockwise from top left are (8 x + 7) degrees, blank, 1, blank. what is the m∠1?

a)21°

b)42°

c)71°

d)82°

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step-by-step explanation:

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.