Respuesta :

77 and 4s+9 are supplementary angles which means they add up to 180.

So if you set up equations you get:
77+4s+9=180

Add the like terms:

86+4s=180

Subtract 86 from both sides:

4s=94

Finally, divide 4 from both sides and you get:

23.5 for your final answer.

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