Answer:
Which of the following is a common sign that a chemical change has occurred?
Step-by-step explanation:
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Answer:
0.62
Step-by-step explanation:
0.5+0.1+.02=0.62
If you are working with time or days, you can't put in a negative value because if you are doing an experiment, you can't go back in time to do that experiment to gather data. (Time for the most part considered to be an input value so that's why I used it as an example.)
<h3>
Answer: D) 130.5 degrees</h3>
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Work Shown:

Note: I used the law of cosines. Make sure your calculator is in degree mode.