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m ≈ 6.4 feet

Step-by-step explanation:

Using the Sine rule in Δ JKM

= , substitute values

= ( cross- multiply )

m sin45° = 7 sin40° ( divide both sides by sin45° )

m = ≈ 6.4 feet ( to the nearest tenth )

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step-by-step explanation:

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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.