Which is the value of this expression when a = 5 and k = negative 2? (StartFraction 3 squared a Superscript negative 2 Baseline Over 3 a Superscript negative 1 Baseline EndFraction) Superscript k
StartFraction 1 Over 75 EndFraction
StartFraction 9 Over 25 EndFraction
StartFraction 25 Over 9 EndFraction
75

C) 4/25

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just sum

10 + 10 = 20

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.