I substituded into the formula, but I'm not sure if its correct. :(

do you think you can solve the others as well? if not thats okay.. my teacher didnt eplain it enough for me. :(

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Can you tell me what the answer is as a decimal?

It was soppose to be 2/5 instead of 25. Im sorry!!

The RS has a line over it. I dont know how to put it on there.

Thank you.

I have to add to get the answer?

What is m∠C?

https://static.k12.com/nextgen_media/assets/8080707-NG_GMT_SemA_05_UT_01.png